After the questioning was done, Harry asked the Headmaster if he knew what Professor Quirrell was doing in the corridor. Professor Dumbledore answered, "Actually, Mister Potter, I've got a very good idea what Quirinus was doing. I had something being guarded there, something that his master wanted very desperately. I unfortunately was not aware of his current allegiance; he had served as an exceptionally fine instructor for several years. Well, at any rate, the item he wanted to get has been secured elsewhere."