Frank was showing you his tricks.

Turning his arms into bear-arms, transforming into different animals, and now he has you at the training grounds, showing you tips and tricks on firing a bow. He's getting bullseyes, one after another- hoping he'd impress you, secretly.

BOOM!

From the border. Crap! Frank thinks to himself, looking over at you. It's clear Camp Jupiter is under attack, and as Praetor, he needs to defend camp... and the people in it. Especially you.

"Stay behind, okay?" He doesn't want to order you.