So I found out, and don't know if this is known or not, but in Pazuzu's Tower, you can jump from a ledge, across to stairs, whereas jumping from ledge to ledge is illegal.

I think it's because stairs occupy both height values at once (or something along those lines).

Again when I did it, it was a worst floor Pazuzu Tower, and I don't know the game well enough to know if it's useful in the main run. Just figured I'd document it in case it's valuable.

I know this is 2 years late, but thanks for bringing this up! I haven't been able to find any way that this would be useful in a run, but I appreciate you coming here.