I think Sandy was actually the name of the first blond-haired vamp that Riley staked? They met in a demon bar and she started flirting with him and he seemed to be flirting back until he staked her. Which is creepy as fuck.

She and a group of others cornered her en masse with the intent to kill her, were given the chance to walk away and didn't.

Fair enough. I'll have to watch that scene again sometime (I really don't know that I want to watch that ep again - ugh.) It still felt a little unsavory though - and I think it's meant to although they filmed it to look "cool"? I guess another signpost along Buffy's journey into her increasing heart of darkness? (That was not only a mixed metaphor but a badly phrased one, sorry.) She's fooled vamps before to gain advantage but never done that or does so again in the entire series.

Oh and btw - your list on vamp disposal? I liked Buffy's use of a cymbal in The Harvest, and I don't know if this counts but the vampire who gets dusted in mid-air by Faith-in-Buffy in WAY? Awesome.