@Blackstone It's a world of magic, she might be a legit chick that look like a dude.
That and when you're facing certain death against a stupidly overwhelming ennemy, I don't think you have the time or brain power to waste on thinking about that so the MC probably just ran with the first thing he heard.
Also it's nice, he's gonna be able to save the girl at the start, I feel she's the key to a lot of stuff.