Minion Spell

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var fireAt : Transform;
var spellTransform : Transform;
var rotationSpeed2 = 7;
var moveSpeed2 = 10;

function Update () {

    fireAt = GameObject.FindWithTag("tower1").transform;

    spellTransform.rotation = Quaternion.Slerp(spellTransform.rotation,
    Quaternion.LookRotation(fireAt.position - spellTransform.position), rotationSpeed2*Time.deltaTime);
    spellTransform.position += spellTransform.forward * moveSpeed2 * Time.deltaTime;

    if(TowerScript.tower1health <= 0) {

        Destroy(this.gameObject);
    }
}

function OnTriggerEnter (col : Collider) {

    if(col.gameObject.tag == "tower1") {
        TowerScript.tower1health -= 10;
        Destroy(this.gameObject);
    }
}