She could always start throwing obstacles at him...

Trunks kept pace, but was also looking around at the open stretch. Studying, before stopping and turning back to look at the course they'd traversed so far. "Are these the kinds of things Pegasi deal with back in Equestria? I mean, you probably have some kind of organized air-squad of some kind? How do they train?" Did Celestia know, being a princess?

This is all kind of new to Trunks, but he's already trying to think of ways to potentially improve.