Seeing the knight captain curb-stump, and I mean, absolutely destroy the vampires -- makes me wonder if there's anything special about her.
It's not that she's just skilled with a sword or something, that's absurd. That's not remotely enough to do the things she's doing.
I'm torn between: "She's just a cool character and there's nothing to it", and: "It might be a small hint to the fact she's not exactly 100% human either (not necessarily a vampire, but, clearly she has something going on there)".
I'm honestly leaning more towards the former.