I love this story; it's fun watching Alex getting his kicks here. And hey, it's not like the vast majority of vampires don't deserve to get curb-stomped.
The best part of the curb-stomp is it's just mooks, there's no plot relevance with these guys so he can go to town on them and there's no need for a power level discussion about it.
Fact is, most of the vampires pretty much get curb-stomped by Buffy in canon already... I just substituted the one doing most of the asskicking with someone much stronger, much more resilient and far more violent. On a slightly different note, but very much related to Alex Mercer's portrayal in this story: Since there is a better... well, not so much a better one rather than mostly obvious, but you get what I mean, a choice on who he can consume without drawing attention from a lot of people he rather wouldn't have breathing down his neck, so to speak, he can pretty much do as he likes. It just involves a slightly adapted diet for him. Instead of munching on the human population of Sunnydale, he substitutes these with vampires, the random demon or two, and the occasional near-death Hunter. It's less conspicuous for him that way. Edit: Incoming.
Local demons and vampires are probobly hoping to run into the Slayer by now. At least with Buffy it is a good clean death, with Alex . The mayor, well Alex is doing nothing to interupt his plans. Keeping his own nose clean and the riff raff in check. Why bother?
Heh. I imagine Buffy going at some point: And some random vampire goes all: And then Buffy replies, in a faux-depressed manner: As for the Mayor... well, he's going to be in for a surprise once he Ascends. Alex's (likely) response: