diff --git a/battle_srv/protos/room_downsync_frame.pb.go b/battle_srv/protos/room_downsync_frame.pb.go
index 137479f..7b8f1f9 100644
--- a/battle_srv/protos/room_downsync_frame.pb.go
+++ b/battle_srv/protos/room_downsync_frame.pb.go
@@ -44,9 +44,10 @@ type PlayerDownsync struct {
 	Hp                int32   `protobuf:"varint,16,opt,name=hp,proto3" json:"hp,omitempty"`
 	MaxHp             int32   `protobuf:"varint,17,opt,name=maxHp,proto3" json:"maxHp,omitempty"`
 	CharacterState    int32   `protobuf:"varint,18,opt,name=characterState,proto3" json:"characterState,omitempty"`
-	Name              string  `protobuf:"bytes,19,opt,name=name,proto3" json:"name,omitempty"`
-	DisplayName       string  `protobuf:"bytes,20,opt,name=displayName,proto3" json:"displayName,omitempty"`
-	Avatar            string  `protobuf:"bytes,21,opt,name=avatar,proto3" json:"avatar,omitempty"`
+	InAir             bool    `protobuf:"varint,19,opt,name=inAir,proto3" json:"inAir,omitempty"` // by design a standalone field only inferred by the collision result of "applyInputFrameDownsyncDynamicsOnSingleRenderFrame" instead of "characterState", because we need check the transition for "characterState" from this field, i.e. "inAir (prev -> curr)"
+	Name              string  `protobuf:"bytes,20,opt,name=name,proto3" json:"name,omitempty"`
+	DisplayName       string  `protobuf:"bytes,21,opt,name=displayName,proto3" json:"displayName,omitempty"`
+	Avatar            string  `protobuf:"bytes,22,opt,name=avatar,proto3" json:"avatar,omitempty"`
 }
 
 func (x *PlayerDownsync) Reset() {
@@ -207,6 +208,13 @@ func (x *PlayerDownsync) GetCharacterState() int32 {
 	return 0
 }
 
+func (x *PlayerDownsync) GetInAir() bool {
+	if x != nil {
+		return x.InAir
+	}
+	return false
+}
+
 func (x *PlayerDownsync) GetName() string {
 	if x != nil {
 		return x.Name
@@ -236,6 +244,7 @@ type InputFrameDecoded struct {
 	Dx        int32 `protobuf:"varint,1,opt,name=dx,proto3" json:"dx,omitempty"`
 	Dy        int32 `protobuf:"varint,2,opt,name=dy,proto3" json:"dy,omitempty"`
 	BtnALevel int32 `protobuf:"varint,3,opt,name=btnALevel,proto3" json:"btnALevel,omitempty"`
+	BtnBLevel int32 `protobuf:"varint,4,opt,name=btnBLevel,proto3" json:"btnBLevel,omitempty"`
 }
 
 func (x *InputFrameDecoded) Reset() {
@@ -291,6 +300,13 @@ func (x *InputFrameDecoded) GetBtnALevel() int32 {
 	return 0
 }
 
+func (x *InputFrameDecoded) GetBtnBLevel() int32 {
+	if x != nil {
+		return x.BtnBLevel
+	}
+	return 0
+}
+
 type InputFrameUpsync struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1218,7 +1234,7 @@ var file_room_downsync_frame_proto_rawDesc = []byte{
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@@ -1251,258 +1267,261 @@ var file_room_downsync_frame_proto_rawDesc = []byte{
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+	0x62, 0x61, 0x74, 0x74, 0x6c, 0x65, 0x5f, 0x73, 0x72, 0x76, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/frontend/assets/resources/map/dungeon/map.tmx b/frontend/assets/resources/map/dungeon/map.tmx
index 8056712..f2eb67f 100644
--- a/frontend/assets/resources/map/dungeon/map.tmx
+++ b/frontend/assets/resources/map/dungeon/map.tmx
@@ -218,11 +218,11 @@
    </properties>
    <polyline points="0,0 -80,-0.666667 -80,30 0,31.3333"/>
   </object>
-  <object id="48" x="1116" y="1536.67">
+  <object id="48" x="1029.56" y="1536.67">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
-   <polyline points="0,0 -4.66667,12.6667 213.333,14.6667 212.667,-2"/>
+   <polyline points="77,-0.333333 9.10906,14.6667 299.775,14.6667 298.84,-2"/>
   </object>
  </objectgroup>
 </map>
diff --git a/frontend/assets/resources/pbfiles/room_downsync_frame.proto b/frontend/assets/resources/pbfiles/room_downsync_frame.proto
index 26126b3..65d5e06 100644
--- a/frontend/assets/resources/pbfiles/room_downsync_frame.proto
+++ b/frontend/assets/resources/pbfiles/room_downsync_frame.proto
@@ -34,6 +34,7 @@ message InputFrameDecoded {
   int32 dx = 1;
   int32 dy = 2;
   int32 btnALevel = 3;
+  int32 btnBLevel = 4;
 }
 
 message InputFrameUpsync {
diff --git a/frontend/assets/scripts/AttackingCharacter.js b/frontend/assets/scripts/AttackingCharacter.js
index 4aee251..3d446a3 100644
--- a/frontend/assets/scripts/AttackingCharacter.js
+++ b/frontend/assets/scripts/AttackingCharacter.js
@@ -20,6 +20,11 @@ window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.add(window.ATK_CHARACTER_STATE.Id
 window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.add(window.ATK_CHARACTER_STATE.Walking[0]);
 window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.add(window.ATK_CHARACTER_STATE.InAirIdle1[0]);
 
+window.ATK_CHARACTER_STATE_IN_AIR_SET = new Set();
+window.ATK_CHARACTER_STATE_IN_AIR_SET.add(window.ATK_CHARACTER_STATE.InAirIdle1[0]);
+window.ATK_CHARACTER_STATE_IN_AIR_SET.add(window.ATK_CHARACTER_STATE.InAirAtk1[0]);
+window.ATK_CHARACTER_STATE_IN_AIR_SET.add(window.ATK_CHARACTER_STATE.InAirAtked1[0]);
+
 /*
 Kindly note that the use of dragonBones anim is an informed choice for the feasibility of "gotoAndPlayByFrame", which is a required feature by "Map.rollbackAndChase". You might find that "cc.Animation" -- the traditional frame anim -- can also suffice this requirement, yet if we want to develop 3D frontend in the future, working with skeletal anim will make a smoother transition.
 
@@ -101,7 +106,7 @@ cc.Class({
   _interruptPlayingAnimAndPlayNewAnimDragonBones(rdfPlayer, prevRdfPlayer, newCharacterState, newAnimName, underlyingAnimationCtrl, playingAnimName) {
     if (window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(newCharacterState)) {
       // No "framesToRecover"
-      //console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
+      console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
       underlyingAnimationCtrl.gotoAndPlayByFrame(newAnimName, 0, -1);
     } else {
       const animationData = underlyingAnimationCtrl._animations[newAnimName];
@@ -117,7 +122,7 @@ cc.Class({
   _interruptPlayingAnimAndPlayNewAnimFrameAnim(rdfPlayer, prevRdfPlayer, newCharacterState, newAnimName, playingAnimName) {
     if (window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(newCharacterState)) {
       // No "framesToRecover"
-      //console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
+      //console.warn(`#FrameAnim JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
       this.animComp.play(newAnimName, 0);
       return;
     }
diff --git a/frontend/assets/scripts/OfflineMap.js b/frontend/assets/scripts/OfflineMap.js
index cf9c4a9..4d9ae2e 100644
--- a/frontend/assets/scripts/OfflineMap.js
+++ b/frontend/assets/scripts/OfflineMap.js
@@ -320,7 +320,11 @@ cc.Class({
           bulletPushbacks[joinIndex - 1][0] += xfac * bulletCollider.data.pushback; // Only for straight punch, there's no y-pushback
           bulletPushbacks[joinIndex - 1][1] += 0;
           const thatAckedPlayerInNextFrame = nextRenderFramePlayers[potential.data.id];
-          thatAckedPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atked1[0];
+          if (!window.ATK_CHARACTER_STATE_IN_AIR_SET.has(thatAckedPlayerInNextFrame.characterState)) {
+            thatAckedPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atked1[0];
+          } else {
+            thatAckedPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.InAirAtked1[0];
+          }
           const oldFramesToRecover = thatAckedPlayerInNextFrame.framesToRecover;
           thatAckedPlayerInNextFrame.framesToRecover = (oldFramesToRecover > bulletCollider.data.hitStunFrames ? oldFramesToRecover : bulletCollider.data.hitStunFrames); // In case the hit player is already stun, we extend it 
         }
@@ -368,9 +372,9 @@ cc.Class({
         }
 
         const decodedInput = self.ctrl.decodeInput(inputList[joinIndex - 1]);
-
         const prevDecodedInput = (null == delayedInputFrameForPrevRenderFrame ? null : self.ctrl.decodeInput(delayedInputFrameForPrevRenderFrame.inputList[joinIndex - 1]));
         const prevBtnALevel = (null == prevDecodedInput ? 0 : prevDecodedInput.btnALevel);
+        const prevBtnBLevel = (null == prevDecodedInput ? 0 : prevDecodedInput.btnBLevel);
 
         if (1 == decodedInput.btnALevel && 0 == prevBtnALevel) {
           // console.log(`playerId=${playerId} triggered a rising-edge of btnA at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
@@ -386,21 +390,61 @@ cc.Class({
             // console.log(`A rising-edge of meleeBullet is created at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}: ${self._stringifyRecentInputCache(true)}`);
             // console.log(`A rising-edge of meleeBullet is created at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
 
-            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atk1[0];
+            if (!window.ATK_CHARACTER_STATE_IN_AIR_SET.has(currPlayerDownsync.characterState)) {
+              thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atk1[0];
+            } else {
+              thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.InAirAtk1[0];
+            }
           }
         } else if (0 == decodedInput.btnALevel && 1 == prevBtnALevel) {
           // console.log(`playerId=${playerId} triggered a falling-edge of btnA at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
         } else {
           // No bullet trigger, process movement inputs
-          if (0 != decodedInput.dx || 0 != decodedInput.dy) {
-            // Update directions and thus would eventually update moving animation accordingly
-            thatPlayerInNextFrame.dirX = decodedInput.dx;
-            thatPlayerInNextFrame.dirY = decodedInput.dy;
-            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Walking[0];
-            thatPlayerInNextFrame.velX = currPlayerDownsync.speed * decodedInput.dx;
+          if (1 == decodedInput.btnBLevel && 0 == prevBtnBLevel) {
+            const characStateAlreadyInAir = window.ATK_CHARACTER_STATE_IN_AIR_SET.has(thatPlayerInNextFrame.characterState);
+            const characStateIsInterruptWaivable = window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(thatPlayerInNextFrame.characterState);
+            console.log(`playerId=${playerId} triggered a rising-edge of btnB at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}, characStateAlreadyInAir=${characStateAlreadyInAir}, characStateIsInterruptWaivable=${characStateIsInterruptWaivable}`);
+            if (
+              !characStateAlreadyInAir
+              &&
+              characStateIsInterruptWaivable
+            ) {
+              thatPlayerInNextFrame.velY = currPlayerDownsync.speed * 4;
+              thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.InAirIdle1[0];
+              if (window.ATK_CHARACTER_STATE.Walking[0] == currPlayerDownsync.characterState) {
+                console.warn(`curRenderFrameId=${currRenderFrame.id}, playerId=${playerId}, joinIndex=${joinIndex} characterState set to AirIdle1 by jumping`);
+              }
+            }
           } else {
-            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Idle1[0];
-            thatPlayerInNextFrame.velX = 0; // I believe that while jumping, velX shouldn't be snapped to 0 but let's put it this way for now
+            if (0 != decodedInput.dx || 0 != decodedInput.dy) {
+              // Update directions and thus would eventually update moving animation accordingly
+              thatPlayerInNextFrame.dirX = decodedInput.dx;
+              thatPlayerInNextFrame.dirY = decodedInput.dy;
+              if (!window.ATK_CHARACTER_STATE_IN_AIR_SET.has(thatPlayerInNextFrame.characterState)) {
+                thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Walking[0];
+                thatPlayerInNextFrame.velX = currPlayerDownsync.speed * decodedInput.dx;
+                if (window.ATK_CHARACTER_STATE.Idle1[0] == currPlayerDownsync.characterState || window.ATK_CHARACTER_STATE.InAirIdle1[0] == currPlayerDownsync.characterState) {
+                  console.warn(`curRenderFrameId=${currRenderFrame.id}, playerId=${playerId}, joinIndex=${joinIndex} characterState set to Walking by dir input`);
+                }
+              } else {
+                // There's no characterState of "InAirWalking" :)
+                thatPlayerInNextFrame.velX = currPlayerDownsync.speed * decodedInput.dx;
+              }
+            } else {
+              if (!window.ATK_CHARACTER_STATE_IN_AIR_SET.has(thatPlayerInNextFrame.characterState)) {
+                thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Idle1[0];
+                thatPlayerInNextFrame.velX = 0;
+                if (window.ATK_CHARACTER_STATE.Walking[0] == currPlayerDownsync.characterState) {
+                  console.warn(`curRenderFrameId=${currRenderFrame.id}, playerId=${playerId}, joinIndex=${joinIndex} characterState set to Idle1 by no dir input`);
+                }
+              } else {
+                thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.InAirIdle1[0];
+                if (window.ATK_CHARACTER_STATE.Walking[0] == currPlayerDownsync.characterState) {
+                  console.warn(`curRenderFrameId=${currRenderFrame.id}, playerId=${playerId}, joinIndex=${joinIndex} characterState set to AirIdle1 by no dir input but already in air`);
+                }
+              // let inertia carry "velX" when in air
+              }
+            }
           }
         }
       }
@@ -426,28 +470,33 @@ cc.Class({
         let [pushbackX, pushbackY] = [result2.overlap * result2.overlap_x, result2.overlap * result2.overlap_y];
         if (null == potential.data) {
           // "null == potential.data" implies a barrier
-          fallStopping = (currPlayerDownsync.inAir && 0 > pushbackY); // prevents false fall-stopping on the lateral sides  
-          remainsNotInAir = (!currPlayerDownsync.inAir);
-
+          const localFallStopping = (currPlayerDownsync.inAir && 0 > pushbackY); // prevents false fall-stopping on the lateral sides  
+          const localRemainsNotInAir = (!currPlayerDownsync.inAir);
           // [WARNING] As when a character is standing on a barrier, if not carefully curated there MIGHT BE a bouncing sequence of "[(inAir -> dropIntoBarrier ->), (notInAir -> pushedOutOfBarrier ->)], [(inAir -> ..."  
-          if (fallStopping) {
+          if (localFallStopping) {
             pushbackY = 0.95 * pushbackY;
+            fallStopping = true;
           }
-          if (remainsNotInAir) {
+          if (localRemainsNotInAir) {
             pushbackY = 0;
+            remainsNotInAir = true;
           }
         }
         // What if we're on the edge of 2 barriers? Would adding up make an unexpected bounce?
         effPushbacks[joinIndex - 1][0] += pushbackX;
         effPushbacks[joinIndex - 1][1] += pushbackY;
       }
-      if (fallStopping || remainsNotInAir) {
+      if (fallStopping) {
+        thatPlayerInNextFrame.velX = 0;
+        thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Idle1[0];
         thatPlayerInNextFrame.velY = 0;
         thatPlayerInNextFrame.inAir = false;
+        if (window.ATK_CHARACTER_STATE.Walking[0] == currPlayerDownsync.characterState) {
+          console.warn(`curRenderFrameId=${currRenderFrame.id}, playerId=${playerId}, joinIndex=${joinIndex} characterState set to Idle1 by fallStopping`);
+        }
       }
-      if (false == currPlayerDownsync.inAir && true == thatPlayerInNextFrame.inAir) {
-        console.warn(`curRenderFrameId=${currRenderFrame.id}, playerId=${playerId}, joinIndex=${joinIndex} jumping into air: playerllider._coords=${playerCollider._coords}, playerColliderPotential=${0 >= potentials.length ? null : potentials[0]._coords}
-movement=${movements[joinIndex - 1]}, effPushback=${effPushbacks[joinIndex - 1]}`);
+      if (remainsNotInAir) {
+        thatPlayerInNextFrame.inAir = false;
       }
     }
 
diff --git a/frontend/assets/scripts/TouchEventsManager.js b/frontend/assets/scripts/TouchEventsManager.js
index 5a61093..29d7c6b 100644
--- a/frontend/assets/scripts/TouchEventsManager.js
+++ b/frontend/assets/scripts/TouchEventsManager.js
@@ -99,6 +99,7 @@ cc.Class({
     this.cachedBtnLeftLevel = 0;
     this.cachedBtnRightLevel = 0;
     this.cachedBtnALevel = 0;
+    this.cachedBtnBLevel = 0;
 
     this.canvasNode = this.mapNode.parent;
     this.mainCameraNode = this.canvasNode.getChildByName("Main Camera"); // Cannot drag and assign the `mainCameraNode` from CocosCreator EDITOR directly, otherwise it'll cause an infinite loading time, till v2.1.0.
@@ -168,6 +169,9 @@ cc.Class({
         case cc.macro.KEY.h:
           self.cachedBtnALevel = 1;
           break;
+        case cc.macro.KEY.j:
+          self.cachedBtnBLevel = 1;
+          break;
         default:
           break;
       }
@@ -190,6 +194,9 @@ cc.Class({
         case cc.macro.KEY.h:
           self.cachedBtnALevel = 0;
           break;
+        case cc.macro.KEY.j:
+          self.cachedBtnBLevel = 0;
+          break;
         default:
           break;
       }
@@ -400,7 +407,8 @@ cc.Class({
   getEncodedInput() {
     const discretizedDir = this.discretizeDirection(this.stickhead.x, this.stickhead.y, this.joyStickEps).encodedIdx; // There're only 9 dirs, thus using only the lower 4-bits
     const btnALevel = (this.cachedBtnALevel << 4);
-    return (btnALevel + discretizedDir);
+    const btnBLevel = (this.cachedBtnBLevel << 5);
+    return (btnBLevel + btnALevel + discretizedDir);
   },
 
   decodeInput(encodedInput) {
@@ -410,10 +418,12 @@ cc.Class({
       console.error("Unexpected encodedDirection = ", encodedDirection);
     }
     const btnALevel = ((encodedInput >> 4) & 1);
+    const btnBLevel = ((encodedInput >> 5) & 1);
     return window.pb.protos.InputFrameDecoded.create({
       dx: mappedDirection[0],
       dy: mappedDirection[1],
       btnALevel: btnALevel,
+      btnBLevel: btnBLevel,
     });
   },
 });
diff --git a/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js b/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
index a475c83..fa27db9 100644
--- a/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
+++ b/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
@@ -1209,6 +1209,7 @@ $root.protos = (function() {
          * @property {number|null} [hp] PlayerDownsync hp
          * @property {number|null} [maxHp] PlayerDownsync maxHp
          * @property {number|null} [characterState] PlayerDownsync characterState
+         * @property {boolean|null} [inAir] PlayerDownsync inAir
          * @property {string|null} [name] PlayerDownsync name
          * @property {string|null} [displayName] PlayerDownsync displayName
          * @property {string|null} [avatar] PlayerDownsync avatar
@@ -1373,6 +1374,14 @@ $root.protos = (function() {
          */
         PlayerDownsync.prototype.characterState = 0;
 
+        /**
+         * PlayerDownsync inAir.
+         * @member {boolean} inAir
+         * @memberof protos.PlayerDownsync
+         * @instance
+         */
+        PlayerDownsync.prototype.inAir = false;
+
         /**
          * PlayerDownsync name.
          * @member {string} name
@@ -1457,12 +1466,14 @@ $root.protos = (function() {
                 writer.uint32(/* id 17, wireType 0 =*/136).int32(message.maxHp);
             if (message.characterState != null && Object.hasOwnProperty.call(message, "characterState"))
                 writer.uint32(/* id 18, wireType 0 =*/144).int32(message.characterState);
+            if (message.inAir != null && Object.hasOwnProperty.call(message, "inAir"))
+                writer.uint32(/* id 19, wireType 0 =*/152).bool(message.inAir);
             if (message.name != null && Object.hasOwnProperty.call(message, "name"))
-                writer.uint32(/* id 19, wireType 2 =*/154).string(message.name);
+                writer.uint32(/* id 20, wireType 2 =*/162).string(message.name);
             if (message.displayName != null && Object.hasOwnProperty.call(message, "displayName"))
-                writer.uint32(/* id 20, wireType 2 =*/162).string(message.displayName);
+                writer.uint32(/* id 21, wireType 2 =*/170).string(message.displayName);
             if (message.avatar != null && Object.hasOwnProperty.call(message, "avatar"))
-                writer.uint32(/* id 21, wireType 2 =*/170).string(message.avatar);
+                writer.uint32(/* id 22, wireType 2 =*/178).string(message.avatar);
             return writer;
         };
 
@@ -1570,14 +1581,18 @@ $root.protos = (function() {
                         break;
                     }
                 case 19: {
-                        message.name = reader.string();
+                        message.inAir = reader.bool();
                         break;
                     }
                 case 20: {
-                        message.displayName = reader.string();
+                        message.name = reader.string();
                         break;
                     }
                 case 21: {
+                        message.displayName = reader.string();
+                        break;
+                    }
+                case 22: {
                         message.avatar = reader.string();
                         break;
                     }
@@ -1670,6 +1685,9 @@ $root.protos = (function() {
             if (message.characterState != null && message.hasOwnProperty("characterState"))
                 if (!$util.isInteger(message.characterState))
                     return "characterState: integer expected";
+            if (message.inAir != null && message.hasOwnProperty("inAir"))
+                if (typeof message.inAir !== "boolean")
+                    return "inAir: boolean expected";
             if (message.name != null && message.hasOwnProperty("name"))
                 if (!$util.isString(message.name))
                     return "name: string expected";
@@ -1730,6 +1748,8 @@ $root.protos = (function() {
                 message.maxHp = object.maxHp | 0;
             if (object.characterState != null)
                 message.characterState = object.characterState | 0;
+            if (object.inAir != null)
+                message.inAir = Boolean(object.inAir);
             if (object.name != null)
                 message.name = String(object.name);
             if (object.displayName != null)
@@ -1771,6 +1791,7 @@ $root.protos = (function() {
                 object.hp = 0;
                 object.maxHp = 0;
                 object.characterState = 0;
+                object.inAir = false;
                 object.name = "";
                 object.displayName = "";
                 object.avatar = "";
@@ -1811,6 +1832,8 @@ $root.protos = (function() {
                 object.maxHp = message.maxHp;
             if (message.characterState != null && message.hasOwnProperty("characterState"))
                 object.characterState = message.characterState;
+            if (message.inAir != null && message.hasOwnProperty("inAir"))
+                object.inAir = message.inAir;
             if (message.name != null && message.hasOwnProperty("name"))
                 object.name = message.name;
             if (message.displayName != null && message.hasOwnProperty("displayName"))
@@ -1858,6 +1881,7 @@ $root.protos = (function() {
          * @property {number|null} [dx] InputFrameDecoded dx
          * @property {number|null} [dy] InputFrameDecoded dy
          * @property {number|null} [btnALevel] InputFrameDecoded btnALevel
+         * @property {number|null} [btnBLevel] InputFrameDecoded btnBLevel
          */
 
         /**
@@ -1899,6 +1923,14 @@ $root.protos = (function() {
          */
         InputFrameDecoded.prototype.btnALevel = 0;
 
+        /**
+         * InputFrameDecoded btnBLevel.
+         * @member {number} btnBLevel
+         * @memberof protos.InputFrameDecoded
+         * @instance
+         */
+        InputFrameDecoded.prototype.btnBLevel = 0;
+
         /**
          * Creates a new InputFrameDecoded instance using the specified properties.
          * @function create
@@ -1929,6 +1961,8 @@ $root.protos = (function() {
                 writer.uint32(/* id 2, wireType 0 =*/16).int32(message.dy);
             if (message.btnALevel != null && Object.hasOwnProperty.call(message, "btnALevel"))
                 writer.uint32(/* id 3, wireType 0 =*/24).int32(message.btnALevel);
+            if (message.btnBLevel != null && Object.hasOwnProperty.call(message, "btnBLevel"))
+                writer.uint32(/* id 4, wireType 0 =*/32).int32(message.btnBLevel);
             return writer;
         };
 
@@ -1975,6 +2009,10 @@ $root.protos = (function() {
                         message.btnALevel = reader.int32();
                         break;
                     }
+                case 4: {
+                        message.btnBLevel = reader.int32();
+                        break;
+                    }
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -2019,6 +2057,9 @@ $root.protos = (function() {
             if (message.btnALevel != null && message.hasOwnProperty("btnALevel"))
                 if (!$util.isInteger(message.btnALevel))
                     return "btnALevel: integer expected";
+            if (message.btnBLevel != null && message.hasOwnProperty("btnBLevel"))
+                if (!$util.isInteger(message.btnBLevel))
+                    return "btnBLevel: integer expected";
             return null;
         };
 
@@ -2040,6 +2081,8 @@ $root.protos = (function() {
                 message.dy = object.dy | 0;
             if (object.btnALevel != null)
                 message.btnALevel = object.btnALevel | 0;
+            if (object.btnBLevel != null)
+                message.btnBLevel = object.btnBLevel | 0;
             return message;
         };
 
@@ -2060,6 +2103,7 @@ $root.protos = (function() {
                 object.dx = 0;
                 object.dy = 0;
                 object.btnALevel = 0;
+                object.btnBLevel = 0;
             }
             if (message.dx != null && message.hasOwnProperty("dx"))
                 object.dx = message.dx;
@@ -2067,6 +2111,8 @@ $root.protos = (function() {
                 object.dy = message.dy;
             if (message.btnALevel != null && message.hasOwnProperty("btnALevel"))
                 object.btnALevel = message.btnALevel;
+            if (message.btnBLevel != null && message.hasOwnProperty("btnBLevel"))
+                object.btnBLevel = message.btnBLevel;
             return object;
         };