Amnesia Speedrun - game beaten in half an hour

[Zopy]

Yea he literally walks on thin air over to the morgue door... wtf?????

The way ladders the game works (maybe the HPL engine in general) is that after you finish climbing a ladder, you hover in the air for a few seconds before your character actually touches the ground. I'm pretty sure this is not a glitch. Using this, one can exploit the system and skip the control room.