I have a situation where I allowed the greater demon to run freely around DT and slaughter things. Needed to get rid of Ruun so I could freely convert the altar, which was a successful operation.
After dispatching the demon, I returned to Thrundarr for my reward and was surprised to find the room empty. I thought the demon might have killed him but as it turned out, he somehow wandered away from his usual spot.
He keeps walking around the outside corner of the room, unable to get back.
I suppose some pathfinding information could be added so he can properly find his way back to his little room.