For the target to follow the enemy around, I'd try this:

Code:

---

var enemy_handle; // a global handle we can use for transferring pointers

function event_scn()
{
	if (event_type == event_scan)
	{
        enemy_handle = handle(you);
	ent_create(lockon, my.x, got_target);
	}
}

function got_target
{
   my.scale_x = 0.1;
	my.scale_y = my.scale_x;////scale the sprite so it`s no huge
   you = ptr_for_handle(enemy_handle); // now YOU is the enemy
   while(you)
   {
      vec_set(temp,player.x);
      vec_sub(temp,my.x);
      vec_to_angle(my.pan,temp); // turn the target toward the player

      vec_set(temp,nullvector);
      temp.x = 20; // change this if you need to - the distance in front of the enemy
      vec_rotate(temp,my.pan);
      vec_add(temp,your.x);
      vec_set(my.x,temp);

      wait(1);
   }
	
}  

---

The temp.x = 20 line might need to be temp.x = -20, but I'm not sure, I haven't done the math. Test that and see how it serves you.