while i was trying to get all the upgrades at big mt, i saw a nightkin trying to go through a wall so it could kill me.

but i shot and killed it.

http://steamcommunity.com/sharedfiles/filedetails/?id=237533674

Never seen one of them in OWB, very weird. I have never really had any real weird bugs in big MT, couple times nightstalkers stuck in floors, once I had an invisible version of Super Ego, could see his red marker, but never saw him, or him me, but really have not had any bad luck/weird stuff in there yet (knock on wood, it has been years now and still playing, still )