"If it is an illusion, 'tis far more clever than any I've seen." His tone implied that was plainly impossible.

"You may trust this is very odd, no matter how new you are. We are on the wrong floor and the opposite side of the building. I didn't notice us going up any stairs." Loki went to the doorway and ran his hand over the frame, as much as he could reach. "Nothing I can detect..."