Hrm. I've never seen it occur between two NPCs, so I don't know if it works correctly there. I stuck some of the flavor text onto XTC and Vyzh`Dra the Cursed, though.
Code:
sub EVENT_SLAY {
quest::say("Odd, we normally have to drag sacrifices kicking and screaming, but this one all but throws himself at us.");
}
Code:
sub EVENT_SLAY {
quest::shout("Tell your gods that I will be coming for them next!");
}
I can confirm that both of those fire off correctly.