Martial arts clubs and taking the train... There aren't many countries that would refer to them as 'clubs,' and few of those where trains are a primary form of transportation. That combined with her shyness and the fact that a girl her age called him 'sir' helped him piece together where she's likely from.

"Where in Japan did you live?"

He paused, tilting his head slightly. "Kate? Are you referring to Kate Beckett? She's an excellent shot." He nodded, thinking for a moment. He wasn't normally one to strike up conversations with barely legal girls who started out checking him out but if she wanted to learn how to fight... well he couldn't very well begrudge her that, now, could he?

"There's no age limit to learning how to use a firearm but it's not for everyone. Keep that in mind."