His eyes widened and then narrowed again, and although he knew that Lupin had every right in saying that (because he himself wasn't sure he intended to forgive the man) he was upset by it anyway.

"Don't you dare play the martyr here, Lupin--not now."

He made an unintelligible noise of disgust and the ground around them iced over slowly, crackling as it went.

"And you deserve not to be forgiven! To think I'd actually thought that--"

Aware that he'd been about to say something he very much did not want to, let alone think about, he quite literally bit down on his tongue and took a moment to breathe, just. Glowering. Finally, he turned away, eyes shut, ignoring the other man.

"...Never mind. I have work in the morning."