put AI opfor unit into the map watching North, add into the target line "this disableai move", place yourself an blufor unit next to it to the south of it.
Preview.
Observed: enemy is not turning for shooting or anything else, he is just watching the given direction.
Expected: enemy should maintain watching that direction, but when his group has spotted enemies or it hears shooting or it sees movement, what they still do, it should turn himself and engage, without moving from his spot.