So a band of visitors were at my colony, then left as a band of brigands showed up. Somehow they got into a fight, and the pirates left. Then the visitors left. But hang on, eventually one of the visitors was sitting at my dinner table continually eating. Her health said she was incapacitated and starving, but she just kept on eating my food. Eventually I decided to try to capture her, and she died.... only to become an invulnerable, super slow moving corpse that was unkillable.
This was very frightening.