And he wasn't precisely busy, but there was a reason why Arya was the one to come to Romanos instead of him, right? Yet he just needed to take care of something involving the Yearbook and he was completely free to duel...if they were doing so today.

Clearly, by the silvery hummingbird, they were going to. Which was incredibly awesome, it's been forever since they'd dueled. He was missing it quite a bit.

As soon as her patronus made an appearance, the Head Boy left the Yearbook office and got to her super fast. "Professor," he nodded, "Arya," he smiled, "Do we have your permission?" his eyes were on Romanos when he spoke, of course.