Yelling angrily at anyone in the near vicinity with a sword drawn is a totally legitimate response to anything and everything, in Fern's opinion, and it's why he doesn't look too put off by it when she rounds on him. It's probably what he'd do in the same situation, and besides that, she looks kind of familiar. But he can't quite place where he's seen her from, so he just shrugs.

"Uh, I don't know? No? You looking for someone?" He asks, glancing towards the house she came out of. Does someone need stabbing? It sounds like someone needs stabbing, and that's why Fern looks back over at her to point at her blade. "Also, your sword is cool." Because that needs to be mentioned, obviously.