Demon King bugs out when using demonic power during grapples.
If you are in any sort of grapple (which the AI seemingly prioritizes above all else), such as wrestling, 69 or full nelson and she bleeds out to 0 health for the first time and uses demonic power, she breaks out of the hold resumes attacking you normally, while you are perpetually stuck in grappling mode. I just spent 11 turns on the ground, "struggle"-ing against no one, while getting attacked by her. Real shitty way to end an ironman game.
EDIT: also, Demon King has become really weird in latest updates: during ground grappling she sometimes enters a mode where she always wins every check even vs a character with 12 str/end