Oh dang you actually kinda did. With full knowledge there would be a way to work around it but you probably don't have the spell you'd need yet and without getting the one in this room first it's very unlikely you'd be able to get it.
It's likely too late, but if you reload the game without leaving the room it would revert back to how it was when you entered (only saves when you exit a room). But I doubt that helps at this point.