Rockets bending around enemies?

Hello, all. I have a quick fps question. I have these rockets that the player can shoot, but I have the problem that they don’t explode on my enemies, they bend around them and continue their path. I can tell they are going around the enemy because I’ve made a smoke trail and it shows them going around the enemy. the enemy has a sphere collider for a head(for head shots) and a character controller for the main body. The rocket has a simple box collider. Here is the rocket script.

@script AddComponentMenu("FPS / Weapons / Rockets")
@script RequireComponent(AudioSource);

var explosionRadius : float;
var damage : int;
var power : int;
var particleEffect : GameObject;
var sound : AudioClip;
var lifeTime : float;
var Speed : float;
var enemyRocket : boolean = false;
private var audioSource : AudioSource;

function Awake()
{		
	var Player : Transform = gameObject.FindWithTag("Player").transform;
	if(enemyRocket)
		transform.LookAt(Player);
	
	audioSource = gameObject.GetComponent(AudioSource);
	Destroy(gameObject, lifeTime);
}
function OnCollisionEnter(col : Collision)
{
	if(col.gameObject.tag != "Enemy")
		Explode();
}
function OnTriggerEnter(col : Collider)
{
	if(col.gameObject.tag != "Enemy")
		Explode();
}
function Update ()
{
	rigidbody.velocity = transform.forward * Speed;	
}
function Explode () 
{
	var explosionPosition : Vector3 = transform.position;
	var colliders : Collider[] = Physics.OverlapSphere (explosionPosition, explosionRadius);
	for(var hit in colliders)
	{
		hit.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
		if(hit.rigidbody)
		{
			hit.rigidbody.AddExplosionForce(power, explosionPosition, explosionRadius, power);
		}
	}
	if(particleEffect)
	{
		var go : GameObject = Instantiate(particleEffect, transform.position, transform.rotation);
	}
	if(sound != null)
	{
		audioSource.PlayClipAtPoint(sound, explosionPosition);
	}
	Destroy(gameObject);
}

I would say this line is the problem.

if(col.gameObject.tag != "Enemy")
    Explode();

You are checking in oncollision if it is not the enemy, then explode. try == instead of !=