Pulling his wand from his cloak pocket, he looks around cautiously, searching for a barely perceptible glimmer of colour. He doesn't find anything, at least not in the obvious places, and he doesn't have time for a more thorough inspection of the walls (looking behind every pile of books wouldn't help, especially if Albus had actually placed a surveillance rune somewhere - in which case, he'd probably be better off rushing to his room).