Okay, so I recently discovered that Stone Prisoner has an option I've never done before, and i looked in the Keep, and I am not sure if it's represented.
So, you can refuse to help Kitty and return to Mattias and tell him she could not be saved. THEN you can convince him to abandon his daughter, or let him run in and try to save her himself. If he goes in himself, he gets possessed. So, which of these two options is the one represented in the Keep? I just submitted feedback asking for it to be made more clear, and would like to ask others to do the same.