Has PC 6 always had the chance for crazy dangerous monsters, and I just got unlucky with the vault? I had multiple good early prospects get killed there just recently by multiple skeletal warriors, a ratling warlord, and a gorgon. I don't usually see a gorgon in game at all unless I go to the library.
I just got the steam version though - used to play on pre60.
Edit: now that I think more about it, the correct (and simple!) solution would have been to just leave immediately after visiting so that the puppy lives, then come back way later. Still, a gorgon?!