Talk:Durlag's Tower Walkthrough/@comment-85.76.84.98-20190622222936

If you kill the Demon Knight and crack the mirror in very short sequence of each others the game can freeze in a cut scene and you're forced to shut down the game.

Also Mirror Fiends (I guess it depends on your party...?) can cast confusion causing spell which might make your character attack Dalton and screwing up your side quest.