I agree it's not worth a losing a friend, If you went over your rules and asked him not to go in certain area's then that's on him. I'm guessing if he told you that he shot at a doe and found this buck in an area you asked him not to go in, either he is disrespectful or had no idea. I personally would let him take the buck and learn from it. "Don't let him hunt anymore on your lease" That's his bad. Obviously he doesn't know a good friend when he see's one. I agree a "Sancuary" shouldn't be touched but if you have a good pair of rubber boots that are scent free you could find some pretty amazing dead things. This time of year sancuary's are the first place's I tromp through looking for sheds or whatever. Good Luck