Re: Buffy or Angel?
Yes, but as they all had lost their memories, Spike was thinking that maybe he was a vampire with a soul who was on a path of redemption, prompting Buffy's response. The humor of the line being the existence of Angel.
"In Brightest Day, in Blackest Night, no evil shall escape my sight. Let those who worship evil's might, beware my power: Green Lantern's light!"