Alright, so I'm playing with my friends and this happens:

#Edit : it's not a bug, your friend added a plank on a mechanic map that's why you glitched.

Everything going to the top left definitely is a bug. It used to be very easy to recreate by using a spirit in the centre of a b anchor but that was fixed so I don't see why other occurrences of this bug (caused by too many collisions in a short space of time) shouldn't be fixed too.

Impuredeath may well have intentionally made use of a bug, but that doesn't stop it being one.