protected virtual void OnCollisionEnter2D(Collision2D collision)
 {
     if (collision.gameObject.tag == "Enemy")
     {
         DefaultEnemy enemy = collision.gameObject.GetComponent <DefaultEnemy>();
         if (enemy)
         {
             enemy.Shield();
         }
     }
 }
 protected void OnTriggerEnter2D(Collider2D collision)
 {
     if (collision.gameObject.tag == "Enemy")
     {
         DefaultEnemy enemy = collision.GetComponent <DefaultEnemy>();
         if (enemy)
         {
             enemy.Shield();
         }
     }
 }