Need enemy to stop at spotlight flash

"Teleport away", do you mean be removed from your game completely? IE: That enemy is destroyed?

If so, then you can use a trigger. Put a box collider (or collider of your choice) on your enemy, and give it a Rigidbody (if your game is 2D, these would be a 2D box collider, and 2D Rigidbody)

Make sure your light also has a Rigidbody and some type of collider, though youll probably want to disable "use gravity" on the light.

In your AI's script, you would write whatever event you want your AI to following, in the OnTriggerEnter.

 //C#
 void OnTriggerEnter(Collision coll){
     if(coll.gameObject.name.contains("Spotlight")){
         Destroy(this.gameObject);
     }
 }

This would be "OnTriggerEnter2D" and "Collision2D" if your game is a 2D game using sprites instead of game objects.

If youd like the enemy to simply just move away from the light instantly, instead of "Destroy" you could just change its position this.transform.position = new Vector3(100,200,300);, and if you are wanting the AI to simply stop dead in its tracks when it interacts with the light, you would set the AI's movement speed to 0 or have him move in the opposite direction at the same speed he is currently moving, but that all depends how you setup your AI's movement.