Black Widow vs Buffy Summers: Who would win?

Black Widow (left) and Buffy Summers (right)

Joss Whedon had a moment to sit down with USA Today and discuss some of his recent projects which include Comic-Con Episode IV: A Fan's Hope, Cabin in the Woods, and The Avengers. One very interesting question that was asked pinned Black Widow from The Avengers up against Buffy Summer from Buffy the Vampire Slayer in a fight, wondering who would emerge victorious. Whedon's answer was not only thorough but truly showed that he is a great writer and perfectly envisioned the fight in his mind.  

"Buffy would go easy at first, but as soon as Natasha popped her with a Widow Sting, she'd start bringing some slayer brawn to the fray. Natasha's fast, but a couple of good connects and she's wobbling, possibly something broken -- she whips out her glock and now Buffy's dodging -- right where Natasha wants her. Natasha shoots the cable holding the steel barrels and they tumble onto Buffy, nearly burying her -- Buffy just arcs out of the way, grabbing the splintered cable and swinging directly onto Natasha, a bullet grazing her cheek as her feet land hard on the Russian's shoulders, sending her back flat -- crack! -- on the floor, Buffy wrenching the gun away and tossing it, fist ready for the final strike. Natasha, struggling to stay conscious, says the fight's over. Buffy agrees, but Natasha explains: She poisoned Buffy hours ago. That waitress that brought her salad …? Natasha smiles. The poison is dormant -- 'til it's activated by adrenaline. Buffy's eyes narrow. "Too bad I didn't use any." Wham! Natasha's out for the count, and Buffy's heading -- slowly -- to Willow for a mystical cleanse.
That'd be my first guess."

There you have it. Buffy Summers walks away victorious and Black Widow is left laying on the ground. How do you feel about this match-up and how it ended? Like the outcome? Feel it would have went another way?

Source: USA Today