You weren't what? Weren't arguing? Because I could hear you two from all the way in another building!

[Okay, that's a bit of an exaggeration. But it gets the point across nicely.

He doesn't linger in the doorway for long, coming into the lab with a thick, well-worn binder that he slams down onto his desk.]

Listen, doesn't matter. Have either of you found anybody interested in joining the Olympiad? There's not a whole lot of time before we need to start practicing, and it doesn't help to get last-minute replacements who don't know what they're doing!