Well.

That was dumb of him, wasn't it.

River's not a Slayer. She's no stronger than any athletic girl her size. She wasn't born to kill these creatures.

But she has her own speed, faster than almost any human's, and she has her own feel for weapons, born and bred and trained and taught.

(we are of that an-tet, khef and ka)

And if her palm is pricked with splinters now, there's a vampire exploding into dust around her.