Professor Snape: Give me a reason. I beg you!
Professor Lupin: Severus, don't be a fool.
Sirius Black: He can't help it. It's habit, mate.
Professor Lupin: Sirius, be quiet.
Be quiet yourself, Remus!
Sirius walks up to Severus. Severus places his wand to Sirius throat. Remus tries to intervene, then turns away.