A thing I noticed is that on nightmare mode the pred will hear you or whatever you dropped on the ground, but can't recognize what floor the noise happened on. I pick up and drop a key in the second floor bathroom and Tulpy, the fairy and/or pixie pred, is in the storage room on the first floor, which is directly below said bathroom. Speaking of Tulpy, whenever she stands still or turns her wing flapping sounds cuts out and a stepping sound happens repeatedly.