Well, I had a guy hiding in a barn hatchet me to death when I had nothing. Had a twat crossbow me breaking a bone, then leave. Never found out what his problem was, I just walked into the room, and looked at him, he didnt care until I looked over. But, I've had another player (who I never ended up finding/seeing) sniping zombies for me as I was fleeing a horde and fighting said horde. he stopped shooting when the last zombie fell. Running away from a hospital and town. Had another guy hidden shoot a zombie that was chasing me through a field, stopped firing when it fell, dunno who did that one either. Stumbled across a guy in a ghillie suit with a rifle in the woods on a mountain, we just kind of looked at each other, he laid back down, and I went off. EDIT: moral of the story is, I take it in stride, I don't act hostile, and If I have a weapon (or not) I face off direction of them, so they can see I'm not aiming at them, and know I'm friendly (I always forget to voice, or I'm playing when people are sleeping.)