I was fighting Krokapatra for a life troll, so then I fought her. Killed her in like three seconds. Anyway, after I killed her, she just apeared again! Is this supposed to happen?
Was there someone else with you? Sometimes a boss can be immediately "reactivated" if someone else completes a quest requirement or has the same quest requirement and walks over the "activation" point in the room. (Plaza of Conquest anyone???)
In the case of Krokapatra, she is in her own dungeon so that is a little weird.