GameObjects that destroy themselves when there raycast hits the player

i am trying to build a boss ai. i need it to strafe side to side (which works fine) and move towards the player when he is in range of its raycast but instead it destroys itself as soon as the ray cast hits the player it also instantiates othe enemies that find and move toward the player but they destroy themselves also it only happens on this level and i cant work out why. i am new to unity and i have searched around but i cant find any similar questions here is the boss blocks code

 public var moveSpeed : Number = 10.0;
 public var moveDirection : Vector3 = Vector3(0,0,1);    //    Initial movement direction
 public var errorComp : Number = 0.95;    //    This prevents a body of the same size from missing the object it is touching
 var life : int = 60;
 
 var target :Transform;
 
 var speed :int = 20;
 var hit : RaycastHit;
 var distance : float = 10;
 private var Direction : Vector3;
 private var ray : Ray;
 var mask : LayerMask;
 
 
 function Move()
 {
     var moveDistance : Number = moveSpeed * Time.deltaTime;    //    The distance to move this update
     var hitInfo : RaycastHit;    //    The raycast info variable
  
     //    Check if there is anything in the way
     if (Physics.Raycast(this.transform.position , moveDirection , hitInfo , moveDistance + this.collider.bounds.extents.z))
     {
         //    Reduce the movement distance so the AI doesn't run into the wall
         moveDistance = hitInfo.distance - this.collider.bounds.extents.z;
     }
         //    If there is nowhere to move, turn around
     if ( moveDistance < 0.001 )
     {
         //    turn around
         moveDirection.z = -moveDirection.z;
     }
     transform.position += moveDirection * moveDistance;
 }
 
 function Update () {
 Move();
 if (target != null)
         {
         Direction = target.transform.position - transform.position;
         }else{target = gameObject.FindWithTag("player").transform;}
 ray = Ray( this.transform.position , Direction);
 if (Physics.Raycast(transform.position, Direction, distance, mask))
 {
 Debug.DrawRay( ray.origin , ray.direction * distance , Color.green );
 transform.position = Vector3(Mathf.MoveTowards(transform.position.x, target.position.x,Time.deltaTime * speed),0,Mathf.MoveTowards(transform.position.z, target.position.z,Time.deltaTime * speed));     //    If it hits the player, move towards it
 }
 else
 {
 Debug.DrawRay( ray.origin , ray.direction * distance , Color.red );    
 transform.position = Vector3(583.6437,this.transform.position.y,this.transform.position.z);
 }
 }
 
 function damage()
 {
 life -= 1;
 if (life == 0) //only if my life points = 0 will i destroy myself
 {
 Destroy(gameObject);
 }
 }
 function OnCollisionEnter (other : Collision) 
 {
         if (other.gameObject.CompareTag("player")) //send message to the player telling it to destroy itself
         other.gameObject.SendMessage("ApplyDamage");
         Destroy(gameObject);// destroy yourself on impact
 }

i dont know what is going on