Brother In Arms
Following the girl and her disco man outside, the gang are stunned to find they're not needed.
The now obvious vampire grins with delight as another guy appears.
"A threesome?"
"Wash your mouth out!" the man quips, throwing holy-water in it's face, "She's my bleedin' sister"
The girl spins away, taking the stake from the Slayer's hand.
"Can I borrow this? Thanks" she smiles, turning around and expertly dispatching the vamp that her brother was beating on.
"New Slayer in town?" someone guesses, but a certain blonde is too busy gazing at the new male arrival to pay much attention.
Disclaimer - Recognisable characters and dialogue belong to Joss Whedon, Mutant Enemy, and the various writers of Buffy The Vampire Slayer.