修复了boss卡住的bug...吗（？）

ActionTowerDefense/Assets/Scripts/Boss/WaterGhost/WaterSprite.cs

@@ -513,6 +513,7 @@ public class WaterSprite : Boss
                 {
                     if (isDisappear)
                     {
+                        if(pc == null) pc = PlayersInput.instance[0];
                         int faceDir = pc.bodyTrans.transform.localScale.x > 0 ? 1 : -1;
                         transform.position = pc.transform.position + Vector3.right * faceDir * 5;
                         BodyFlickerAppear();