Destroying a clones

Unity Engine
1

I’ve got several clone NPCs and have this function in them:

function applyDamage(dam : int)
{
	health = (health - dam);
	Debug.Log("health--");
	if (health <= 0)
	{
		Destroy(gameObject);
	}	
}

The projectile class has this when hit:

    for (var hit : Collider in colliders) {
        if (!hit)
            continue;
        
        if (hit.gameObject.name == "Enemy_L1"){
		 		hit.gameObject.SendMessage("applyDamage", 10);
            }
            
            gameObject.Destroy(gameObject);

My problem is that when one NPC is hit with the projectile, all of them die. How do i just destroy one of them?

2

Fixed
Here’s the new code:

function applyDamage(dam : int)
{
	health = (health - dam);
	Debug.Log("health-------------------");
	if (health <= 0)
	{
		Destroy(gameObject);
	}	
}

function OnCollisionEnter(myCol: Collision){
	Debug.Log("I'm in");
    // Applies an explosion force to all nearby rigidbodies
    var explosionPos : Vector3 = transform.position;
    var colliders : Collider[] = Physics.OverlapSphere (explosionPos, radius);
    

        
		myCol.gameObject.SendMessage("applyDamage",damage);
        Destroy(gameObject);
    }