*goes white with fury at Q's reminder about Harry, but remains civil* *gives up* I see. Well. It would appear the three of you# have the situation well in hand, then.
*pushes his coffee cup-and-saucer to one side to indicate that he's done* If there's nothing else?
Sirius and I are both working from book, rather than movie canon (I really, really hate the movies), and in the book, Quirrell was stuttering before he was fully possessed (he was able to shake hands with Harry at the start of HPatPS, frex), so Sirius will remain... unconvinced. That is, stuttering probably does mean that something's wrong, but non-stuttering doesn't mean that nothing's wrong ;)