Tell him that we don't need slob hunters out there wrecking it for us that are responsible. If he can't have enough respect for the animal and the sport, then he should not be out there hunting. It is his responsibility to make sure he shoots accurately or not shoot at all.

If he is hunting on land that you both have permission for, you could get yourself booted off the land by the owner, if he finds out about this guys irresponsibility. I would tell him that if he can't square up, then I would not hunt with him.