diff --git a/js/plugins/SF_Managers.js b/js/plugins/SF_Managers.js
index d5d9ad3..c59bb8e 100644
--- a/js/plugins/SF_Managers.js
+++ b/js/plugins/SF_Managers.js
@@ -9,9 +9,9 @@ Imported.SF_Managers = true;
 var SF_Plugins = SF_Plugins || {};
 //=============================================================================
 /*:
-    * @plugindesc Managers lib for salted fish plugins
-    * @author Salted Fish
-    */
+ * @plugindesc Managers lib for salted fish plugins
+ * @author Salted Fish
+ */
 //=============================================================================
 
 (function () {
@@ -25,24 +25,24 @@ var SF_Plugins = SF_Plugins || {};
     //=============================================================================
 
     ImageManager.loadSceneActor = function (filename) {
-        return this.loadBitmap('img/scene_ui/scene_actor/', filename, 0, true);
+        return this.loadBitmap("img/scene_ui/scene_actor/", filename, 0, true);
     };
 
     ImageManager.loadSceneActorSelect = function (filename) {
-        return this.loadBitmap('img/scene_ui/scene_actor_select/', filename, 0, true);
-    }
+        return this.loadBitmap("img/scene_ui/scene_actor_select/", filename, 0, true);
+    };
 
     ImageManager.loadSceneTitle = function (filename) {
         return this.loadBitmap("img/scene_ui/scene_title/", filename, 0, true);
-    }
+    };
 
     ImageManager.loadSceneMenu = function (filename) {
-        return this.loadBitmap('img/scene_ui/scene_menu/', filename, 0, true);
+        return this.loadBitmap("img/scene_ui/scene_menu/", filename, 0, true);
     };
 
     ImageManager.loadSceneSplash = function (filename) {
-        return this.loadBitmap('img/scene_ui/scene_splash/', filename, 0, true);
-    }
+        return this.loadBitmap("img/scene_ui/scene_splash/", filename, 0, true);
+    };
 
     //=============================================================================
     // SceneManager
@@ -62,7 +62,8 @@ var SF_Plugins = SF_Plugins || {};
         if (this._sceneBeforeClasses[sceneClass]) {
             var beforeSceneList = this._sceneBeforeClasses[sceneClass];
             var index = beforeSceneList.indexOf(this._scene.constructor);
-            if (index == -1) { // if the scene is not in the array
+            if (index == -1) {
+                // if the scene is not in the array
                 this._stack.push(sceneClass);
                 SF_Managers.SceneManager_goto.call(this, beforeSceneList[0]);
             } else if (index === beforeSceneList.length - 1) {
@@ -74,7 +75,7 @@ var SF_Plugins = SF_Plugins || {};
         } else {
             SF_Managers.SceneManager_goto.call(this, sceneClass);
         }
-    }
+    };
 
     SceneManager.addSceneBefore = function (beforeSceneClass, sceneClass) {
         if (this._sceneBeforeClasses[sceneClass]) {
@@ -82,10 +83,48 @@ var SF_Plugins = SF_Plugins || {};
         } else {
             this._sceneBeforeClasses[sceneClass] = [beforeSceneClass];
         }
-    }
+    };
 
     SceneManager.initCallBack = function () {
         CallBack.initialize();
-    }
+    };
 
-})();
\ No newline at end of file
+    //=============================================================================
+    // BattleManager
+    //=============================================================================
+    BattleManager.invokeNormalAction = function (subject, target) {
+        var realTarget = this.applySubstitute(target, subject);
+        this._action.apply(realTarget);
+        this._logWindow.displayActionResults(subject, realTarget);
+    };
+
+    BattleManager.applySubstitute = function (target, subject) {
+        if (this.checkSubstitute(target, subject)) {
+            var substitute = target.friendsUnit().substituteBattler();
+            if (substitute && target !== substitute) {
+                this._logWindow.displaySubstitute(substitute, target);
+                return substitute;
+            }
+        }
+        return target;
+    };
+
+    SF_Managers.BattleManager_checkSubstitute = BattleManager.checkSubstitute;
+    BattleManager.checkSubstitute = function (target, subject) {
+        if (!subject && !this._action.isForOpponent()) return false;
+        if (subject && target.friendsUnit() === subject.friendsUnit()) return false;
+        if (!(this._action.isHpEffect() || this._action.isMpEffect())) return false;
+        if (this._action.isCertainHit()) return false;
+
+        // 只有 hp 和 bp 最低的对象才能触发替身
+        var targetHpBp = target.hp + target.barrierPoints();
+        var lowestMember = target
+            .friendsUnit()
+            .members()
+            .reduce(function (a, b) {
+                var bHpBp = b.hp + b.barrierPoints();
+                return a && a.hp + a.barrierPoints() < bHpBp ? a : b;
+            }, target);
+        return targetHpBp === lowestMember.hp + lowestMember.barrierPoints();
+    };
+})();