So I didn't even connect this to that scene in Interview with a Vampire where they lure them in to kill Kirsten Dunst. But now that I think about it, it was all very similar.
And I think the fact that Guilleirmo was able to off all those vampires is because of how lame they are. He was one guy and the minute he killed the vampire on the stage everyone started running. He only had one group swarm over him and he got them with the holy water super soakers.