You really capture that sense of chaos well; everything is happening at once, and it's difficult to know exactly what's going on. Nice job!

Dawn had wondered in the past why vampire saliva should be able to stop bleeding – it was more an anticoagulant than anything – but it was one of those ‘things’ about vampires, like mirrors and invitations.

I have to say that "Spike's (or Angel's) magical healing spit" is one of those fan-fiction quirks that's never made logical sense to me. Frankly your "it just is" explanation makes the most sense of anything I've read so far! And Hey, if it furthers the plot... :D

So they know about Ethan Rayne and about the rogue slayer... The pieces are coming together!