[She's just going to bring her uninjured hand to her face. It's definitely not to hide the small smile on her face at his rambling.]

...I think you'd win that competition, with all your energy.

[Despite that her wings gave a small flutter. Then her hand fell to start brushing imaginary wrinkles out of clothes. Any traces of the smile were gone. She'd replaced it with a stern glare.]

I'd be fine. Even if I can only make it over the wall, I'd be fine walking after that.

[She isn't even going to point out that they don't know where home is. And for his sake she's going assume he was referring to her height.]