Xan and Imoen most certainly are comic relief for the most part-unless I write a bit from one of their perspectives, you won't see anything going on between them other than what Alexandria sees/hears. But you can expect a suitably dark turn in their relationship in the
BG2 section (which isn't terribly far off, now...)
Writing Sarevok's speech was by far the most fun part of the chapter, as a writer. By every indication in
BG1, Sarevok is charismatic, popular, and ruthlessly intelligent, which is what I was really trying to display in this chapter. At the moment, Bhaal and the prophecies, while lurking in the background, haven't yet come out in the open, and no one but Rieltar, Tamoko, and a few others know who Sarevok's real father is. Though that isn't scheduled to last for much longer now...
And since I cannot resist the temptation to taunt, the next chapter is going to see the culmination of one of the biggest but most subtle subplots I've had going for a while-it was in fact the very first chapter I ever wrote for ASE, though I'm now extending it and preparing it for its full debut. It will be by far the longest chapter I've written thus far. Night is falling...