Ah...the "let's bet the girl as property" and "vs. handsome guy" tropes. Of course.
He didn't really need to prostrate himself either. I'm pretty sure he could've just turned down his duel request without issue.
That said, I appreciate the MC having his priorities straight.
1. Don't bet your party members like they're items (Ironically for a gatcha).
2. Preparation for the match starts before you even accept it.