Raycast - enemy does not look forward but into the same point ...

I have no idea why the emeny sends raycast into the same targetPosition .....

here is the code :

     //Send raycast to imitate enemy sight
 void SendRaycast() {
     //Start and end point of raycasts
     Vector3 startPosition = transform.position;
     Vector3 targetPosition = Vector3.zero;

     //Start and end angle of raycasts
     int startAngle = (int)(-angle * 0.5F);  // half the angle to the Left of the forward
     int finishAngle = (int)(angle * 0.5F); // ..... and to the Right

     int inc = (int)( angle / 10 );

     //raycast that we are going to 'send'
     RaycastHit hit;

     // step through and find each target point
     for(int i = startAngle; i < finishAngle; i += inc ) // Angle from forward
     {
         targetPosition = (Quaternion.Euler( 0, i, 0 ) * transform.forward ).normalized * 5.0f;
         //targetPosition = transform.forward;

         // linecast between points
         if ( Physics.Linecast( startPosition, targetPosition, out hit ) )
         {
             if(hit.collider.gameObject.tag == "Player") {
                 chase = true;
                 Debug.Log("See Player");
             }
         }            
         // to show ray just for testing
         Debug.DrawLine( startPosition, targetPosition, Color.green );
     } 
 }