So, basically, a fighting posture for when you are attacking an enemy who is grappling someone, where you only attack when you're sure you're not going to hit the grappled person. It would be sort of like guarded, where you hang back and don't attack, unless the is an opening, reducing your chance of friendly fire. It wouldn't completely eliminate it, of course, depending on the stats and skills of those involved, but at least minimize it.
