want to generate a rebound, found problem

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class EnemyLaser01 : MonoBehaviour {
5.     public Transform tlaser01;
6.     public float laserLife = 6f;
7.     public float laserSpeed = 60f;
8.     public float extradamage = 1;
9.     public float fwbw = 0f;
10.     // Use this for initialization
11.     void Start () {
12.         tlaser01 = transform;
13.         fwbw = Random.Range (149f, 225f);
14.     }
15.  
16.     // Update is called once per frame
17.     void Update () {
18.  
19.         laserLife -= Time.deltaTime;
20.         if (laserLife <= 0) {
21.             Destroy(this.gameObject);
22.         };
23.  
24.         tlaser01.Translate (Vector3.forward * laserSpeed * Time.deltaTime);
25.  
26.  
27.     }
28.     void OnTriggerEnter (Collider lasercollider) {
29.  
30.         if (lasercollider.CompareTag ("PlayerShip")) {
31.             PlayerScript.GET.curHealth = PlayerScript.GET.curHealth - extradamage;
32.             Destroy(this.gameObject);
33.         };
34.         if (lasercollider.CompareTag ("PlayerShield")) {
35.             Debug.Log ("entered");
36.             this.gameObject.tag = "PlayerAmmoX";
37.             tlaser01.rotation = new Quaternion (0f, fwbw,0f,0f) ;
38.         };
39.     }
40. }

want that laser to rebound on shield on a random Y angle buuuuuuuuut it doesn't work, it only returns 180 as its angle, even when i designed it to be random...

 

also tryed to get

tlaser01.rotation = Quaternion.Inverse(tlaser01.rotation)

and doesn't even change rotation