diff --git a/src/main/java/cactusServer/models/CollisionManager.java b/src/main/java/cactusServer/models/CollisionManager.java
index 2de5987..8634441 100644
--- a/src/main/java/cactusServer/models/CollisionManager.java
+++ b/src/main/java/cactusServer/models/CollisionManager.java
@@ -15,10 +15,11 @@
 public class CollisionManager {
 	private static CollisionManager theInstance;
 	private HashMap<String, Instance> instances;
-	private ArrayList<CollisionResult> resultList = new ArrayList<CollisionResult>();
+	private ArrayList<CollisionResult> resultList;
 
 	private CollisionManager() {
 		instances = Instances.getInstance().getInstances();
+		resultList = new ArrayList<CollisionResult>();
 	}
 
 	public static CollisionManager getInstance() {
@@ -27,7 +28,7 @@
 		}
 		return theInstance;
 	}
-	
+
 	@JSONHint(ignore = true)
 	public ArrayList<CollisionResult> getResultList() {
 		return resultList;
@@ -55,7 +56,7 @@
 		CollisionResult result;
 		result = PhysicsUtility.checkCollision(player.getObject(), null, object.getObject(), null);
 		if (result != null) {
-			objMove(result,object);
+			objMove(result, object, false);
 		}
 	}
 
@@ -66,16 +67,18 @@
 			Vector3d vec1 = object1.getVelocity().getVector3d();
 			Vector3d vec2 = object2.getVelocity().getVector3d();
 			if (vec1.length() > vec2.length()) {
-				objMove(result,object1);
-			}else {
-				objMove(result,object2);
+				objMove(result, object1, true);
+			} else {
+				objMove(result, object2, true);
 			}
 		}
 	}
-	
-	private void objMove(CollisionResult result,Object object) {
+
+	private void objMove(CollisionResult result, Object object, boolean negate) {
 		result.normal.scale(-1);
 		Vector3d vec = object.getPosition().getVector3d();
+		if (negate)
+			result.normal.negate();
 		vec.add(result.normal);
 		object.setPosition(new Position3D(vec));
 	}
diff --git a/src/main/java/cactusServer/utils/App.java b/src/main/java/cactusServer/utils/App.java
index 2b678b2..e0d27bc 100644
--- a/src/main/java/cactusServer/utils/App.java
+++ b/src/main/java/cactusServer/utils/App.java
@@ -94,9 +94,11 @@
 		Instances.getInstance().getInstance("test1").createObject(new Position3D(0, 0, 0), new Velocity3D(),
 				new AngularVelocity3D(), new Quaternion3D(), new Attribute(true, 1), 0);
 		// �_�~�[�o���b�g
-		Instances.getInstance().getInstance("test1").createBullet("player1", "testBulletId1", new Position3D(), new Quaternion3D());
-		Instances.getInstance().getInstance("test1").createBullet("player1", "testBulletId2", new Position3D(), new Quaternion3D());
-		
+		Instances.getInstance().getInstance("test1").createBullet("player1", "testBulletId1", new Position3D(),
+				new Quaternion3D());
+		Instances.getInstance().getInstance("test1").createBullet("player1", "testBulletId2", new Position3D(),
+				new Quaternion3D());
+
 		// // �m�F�p
 		// String player1Encode = JSON.encode(player1, true);
 		// String player2Encode = JSON.encode(player2, true);