I have no idea what happened, I was on the other floor walked through the door where there are like two paths with a bottom half creature, killed it and then went to break the box and then randomly some insanely fast creature scared the hell out of me, hit me once and then I fell into the void.
As you might have noticed, some of the creatures are lacking vital bodily functions, such as brains. This might lead into unexpected and weird behaviour, such as not stopping properly and accidently pushing the player through the wall. (none of this was intentional, the collision detection and enemy AI are just dogshit)