Thanks! My current plan is actually along the lines of the player being quite fragile - the AI will be equipped with crucifixes, holy water, stakes, etc. and if you get close to them with them aware of your presence they'll charge at and attack you (one-hit kill), forcing you to rely on stealth. At the very end of the video you can see I dropped down in the reflected world because there was no light on that side, allowing me to get right up to the target before switching back to feed / win the level.