Unless they were Caster, or perhaps Assassin. Oh, wait.

[She offers him a sweet smile, even as she attempts to pull her sword up, and away from his. This doesn't really feel like a lesson. Then again, she's not good about answering his questions either.

Why? No real reason. Mostly because she can.]

But, if I am from Fuyuki, there is only the process of elimination. Or, Occum's razor.