Sirius continues looking fierce. Well, as fierce as Professor Snape can look. Which is actually pretty fierce. He strides over to Remus and stands in front of him, trying to peer down his nose at him. But it's rather hard since Remus is about his height, maybe a few inches shorter.

"Rather brave of you to stay and accept your punishment, Master Lupin. I was warned about you and your little friends, what are their names? I believe it's Master Plotter, Master Perigrew. And of course, that infamous Master Black." He gives him another stern look, letting it sink in. He's so milking this for all it's worth. "Most students would have taken off running by now. I suppose you think you're being noble. Well, cut that out. Now, give me an explanation! What are you doing playing hooky?"