diff --git a/logic/Client/MainWindow.xaml.cs b/logic/Client/MainWindow.xaml.cs
index 603597a..b42743c 100644
--- a/logic/Client/MainWindow.xaml.cs
+++ b/logic/Client/MainWindow.xaml.cs
@@ -851,7 +851,7 @@ namespace Client
                             {
                                 case Protobuf.BulletType.BombBomb:
                                     {
-                                        double bombRange = 1.0*data.BombRange / Preparation.Utility.GameData.numOfPosGridPerCell;
+                                        double bombRange = 1.0 * data.BombRange / Preparation.Utility.GameData.numOfPosGridPerCell;
                                         Ellipse icon = new()
                                         {
                                             Width = 2 * bombRange * unitWidth,
diff --git a/logic/GameClass/GameObj/Map/Map.cs b/logic/GameClass/GameObj/Map/Map.cs
index adbfc49..75645fc 100644
--- a/logic/GameClass/GameObj/Map/Map.cs
+++ b/logic/GameClass/GameObj/Map/Map.cs
@@ -221,6 +221,20 @@ namespace GameClass.GameObj
             }
             return flag;
         }
+        public bool RemoveJustFromMap(GameObj gameObj)
+        {
+            GameObjLockDict[gameObj.Type].EnterWriteLock();
+            bool flag;
+            try
+            {
+                flag = GameObjDict[gameObj.Type].Remove(gameObj);
+            }
+            finally
+            {
+                GameObjLockDict[gameObj.Type].ExitWriteLock();
+            }
+            return flag;
+        }
         public void Add(GameObj gameObj)
         {
             GameObjLockDict[gameObj.Type].EnterWriteLock();
diff --git a/logic/GameRules.md b/logic/GameRules.md
index f7903d1..377f1ab 100644
--- a/logic/GameRules.md
+++ b/logic/GameRules.md
@@ -1,5 +1,5 @@
 # 规则
-V4.0
+V4.1
 - [规则](#规则)
   - [简则](#简则)
     - [地图](#地图)
diff --git a/logic/Gaming/AttackManager.cs b/logic/Gaming/AttackManager.cs
index 312f336..44dbea5 100644
--- a/logic/Gaming/AttackManager.cs
+++ b/logic/Gaming/AttackManager.cs
@@ -6,6 +6,7 @@ using Preparation.Utility;
 using GameEngine;
 using Preparation.Interface;
 using Timothy.FrameRateTask;
+using System.Numerics;
 
 namespace Gaming
 {
@@ -73,22 +74,34 @@ namespace Gaming
 #endif
                 bullet.CanMove = false;
 
-                if (gameMap.Remove(bullet) && bullet.BulletBombRange > 0)
-                    gameMap.Add(new BombedBullet(bullet));
-
                 if (bullet.BulletBombRange == 0)
                 {
+                    gameMap.Remove(bullet);
                     if (objBeingShot == null)
                     {
-                        characterManager.BackSwing((Character?)bullet.Parent, bullet.Backswing);
+                        characterManager.BackSwing((Character)bullet.Parent, bullet.Backswing);
                         return;
                     }
 
                     BombObj(bullet, objBeingShot);
-                    characterManager.BackSwing((Character?)bullet.Parent, bullet.RecoveryFromHit);
+                    characterManager.BackSwing((Character)bullet.Parent, bullet.RecoveryFromHit);
                     return;
                 }
 
+                if (gameMap.Remove(bullet))
+                {
+                    BombedBullet bombedBullet = new(bullet);
+                    gameMap.Add(bombedBullet);
+                    new Thread
+                                (() =>
+                                {
+                                    Thread.Sleep(GameData.frameDuration);
+                                    gameMap.RemoveJustFromMap(bombedBullet);
+                                }
+                                )
+                    { IsBackground = true }.Start();
+                }
+
                 /*if (objBeingShot != null)
                 {
                     else if (objBeingShot is Bullet)        //子弹不能相互引爆，若要更改这一设定，取消注释即可。
@@ -138,10 +151,10 @@ namespace Gaming
 
                 if (objBeingShot == null)
                 {
-                    characterManager.BackSwing((Character?)bullet.Parent, bullet.Backswing);
+                    characterManager.BackSwing((Character)bullet.Parent, bullet.Backswing);
                 }
                 else
-                    characterManager.BackSwing((Character?)bullet.Parent, bullet.RecoveryFromHit);
+                    characterManager.BackSwing((Character)bullet.Parent, bullet.RecoveryFromHit);
             }
 
             public bool Attack(Character player, double angle)
@@ -169,35 +182,20 @@ namespace Gaming
                     if (bullet.CastTime > 0)
                     {
                         characterManager.SetPlayerState(player, PlayerStateType.TryingToAttack);
-
-                        new Thread
+                        if (bullet.IsRemoteAttack)
+                        {
+                            new Thread
                                 (() =>
                                 {
-                                    new FrameRateTaskExecutor<int>(
-                                    loopCondition: () => player.PlayerState == PlayerStateType.TryingToAttack && gameMap.Timer.IsGaming,
-                                    loopToDo: () =>
+                                    Thread.Sleep(bullet.CastTime);
+                                    if (player.PlayerState == PlayerStateType.TryingToAttack)
                                     {
-                                    },
-                                    timeInterval: GameData.frameDuration,
-                                    finallyReturn: () => 0,
-                                    maxTotalDuration: bullet.CastTime
-                      )
-
-                          .Start();
-
-                                    if (gameMap.Timer.IsGaming)
-                                    {
-                                        if (player.PlayerState == PlayerStateType.TryingToAttack)
-                                        {
-                                            characterManager.SetPlayerState(player);
-                                        }
-                                        else
-                                            bullet.IsMoving = false;
-                                        gameMap.Remove(bullet);
+                                        characterManager.SetPlayerState(player);
                                     }
                                 }
                                 )
-                        { IsBackground = true }.Start();
+                            { IsBackground = true }.Start();
+                        }
                     }
                 }
                 if (bullet != null)
diff --git a/logic/Gaming/CharacterManager .cs b/logic/Gaming/CharacterManager .cs
index 3b7a11e..e5242a0 100644
--- a/logic/Gaming/CharacterManager .cs	
+++ b/logic/Gaming/CharacterManager .cs	
@@ -354,9 +354,9 @@ namespace Gaming
                 else TryBeAwed(student, bullet);
             }
 
-            public bool BackSwing(Character? player, int time)
+            public bool BackSwing(Character player, int time)
             {
-                if (player == null || time <= 0) return false;
+                if (time <= 0) return false;
                 if (player.PlayerState == PlayerStateType.Swinging || (!player.Commandable() && player.PlayerState != PlayerStateType.TryingToAttack)) return false;
                 SetPlayerState(player, PlayerStateType.Swinging);
 
diff --git a/logic/Server/CopyInfo.cs b/logic/Server/CopyInfo.cs
index ba57920..d255068 100644
--- a/logic/Server/CopyInfo.cs
+++ b/logic/Server/CopyInfo.cs
@@ -148,6 +148,7 @@ namespace Server
             {
                 BulletMessage = new()
                 {
+                    Type = Transformation.ToBulletType(bullet.TypeOfBullet),
                     X = bullet.Position.x,
                     Y = bullet.Position.y,
                     FacingDirection = bullet.FacingDirection.Angle(),
@@ -184,6 +185,7 @@ namespace Server
             {
                 BombedBulletMessage = new()
                 {
+                    Type = Transformation.ToBulletType(bombedBullet.bulletHasBombed.TypeOfBullet),
                     X = bombedBullet.bulletHasBombed.Position.x,
                     Y = bombedBullet.bulletHasBombed.Position.y,
                     FacingDirection = bombedBullet.FacingDirection.Angle(),
@@ -191,6 +193,7 @@ namespace Server
                     BombRange = bombedBullet.bulletHasBombed.BulletBombRange
                 }
             };
+            //   Debugger.Output(bombedBullet, bombedBullet.Place.ToString()+" "+bombedBullet.Position.ToString());
             return msg;
         }