That's quite funny, how did you do that?
I play it nomally until I went on a the same stair 3 times and saw a wall seem broken down of an explosion or something. Try to walk through the hole but get stuck by invisible wall, managed to peek through the wall though...
Thank you! I was able to figure out the bug, it wasn't blocked when re-entering the first floor of the game.
That is where you came from, story-wise speaking.
