OnColliderEnter - Turret Shoot Only once problem

Hello I using this script (thanks to tornado twins) I upgrade it with if (TurretDistance.ShootDistance == true ){ blah blah} but when i enter a collider it makes only one shoot and then only rotating on my position can anyone tell me why ? thanks

Code:

 var LookAtTarget:Transform;
 var damp = 2.0;
 var bullitPrefab:Transform;
 var savedTime=0;
 
 function Update () {   
         if(LookAtTarget){
             var rotate = Quaternion.LookRotation(LookAtTarget.position - transform.position);
             transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp);
                 //transform.LookAt(LookAtTarget);
             var seconds : int = Time.time;
             var oddeven = (seconds % 2);
 
             if(oddeven)         
             {
                 Shoot(seconds);
             } 
         }
     }
   
     function Shoot(seconds)
     { 
         if (TurretDistance.ShootDistance == true ){
             if(seconds!=savedTime){
                var bullit = Instantiate(bullitPrefab ,transform.Find("spawnPoint").transform.position ,
                         Quaternion.identity);
             bullit.gameObject.tag = "FireballEnemy";            
             bullit.rigidbody.AddForce(transform.forward * 10000);
             savedTime=seconds;
             }
         }

Code:

 static var ShootDistance = false;
 
 function OnTriggerEnter (other : Collider) {
     ShootDistance = true ;
 }
 
  function OnTriggerExit (other : Collider) {
     ShootDistance = false ;
 }