He complained before taking out a small vial filled with a highly flammable chemical compound in it, which "accidentally" fell out of his hands.
The window that was opened by him while entering also seemed to be locked now. Odd in a way if not for his experience with dealing with such situations before. Even if he can't see or smell it. He knew either a mechanical latch or a magic rune was at word and trying to open that lock might have unpredictable circumstances.
None of which he wished to face. Considering the man he had kept track of was a dwarf, he could feel that the locks were mechanical and with the need to keep this place secret, it also meant that most of the time it should be hidden weapons, silent and lethal.
Or no weapons at all. Directly locking him inside, until the people who were currently reaching for this room dealt with him or any such intruders.
