That makes sense. In a real battle, there would typically be another unit there (other than at the ends of the line), and at the ends of the line it's likely you would react as you said - swiveling the unit to put the side edge out of LOS or controlling the distance to prevent the pinch, either of which is easy to do with a command point.
In military parlance that is called refusing the flank, i.e. it is a real world tactic, the need for which BG catches beautifully.