AI- trouble making NPC attack effect NPCs differently than player

I'm pretty new to Unity, so please bare with me. I have an invulnerable monster that attacks the player and allies. So I use FindGameObjectsWithTag to chase the player group.

like so:

 var localEnemies : GameObject[];
 localEnemies = GameObject.FindGameObjectsWithTag("opponents"); 

I think this is pretty standard and works without problem. Just to test the code if NPCs are hit they are destroyed and if the player is hit a game over scene is loaded. How can I get the player object recognized outside the tag used for tracking position? Here is the code I'm working with. -

 function OnCollisionEnter(collision : Collision)
 {
     var thing : GameObject = collision.gameObject;
     if(thing.tag == "opponents" || thing.tag == "trap")
     {
         if(thing.tag == "opponent" && thing == GameObject.Find("Player"))
         {
             status = false;
             animation.Play("attackMajor");
             Instantiate(small_flame, thing.transform.position, thing.transform.rotation);
             Application.LoadLevel("GameOver");
         }
         else if(thing.tag == "opponents" && thing != player)
         {
             status = false;
             animation.Play("attackMajor");
             Instantiate(small_flame, thing.transform.position, thing.transform.rotation);
             yield WaitForSeconds(3);
             Destroy(thing);
         }
         else if(thing.tag == "trap")
         {
             status = false;
             animation.Play("rage");
             yield WaitForSeconds(3);
             Instantiate(small_flame, thing.transform.position, thing.transform.rotation);
             Destroy(thing);
         }
 
          speed = 1;
          status = true;
     }
 }

Any help would be really appreciated!