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Xzar's Saved by the Spell
A user by the name of Myrmuzduur discovered a way to save Xzar from the Harper Assassin. I couldn't find this story anywhere else but here.http://www.gamefaqs.com/boards/258273-baldurs-gate-ii-shadows-of-amn/66939866?page=1
I did it!
Imprisonment was the answer. He has to be imprisoned a split second before the Harper spawns, just as he finishes casting the polymorph spell which causes her to spawn.
Here is the timing I managed to achieve. Edwina casts Imprisonment and just as the cage animation appears, I talk to Xzar:
And here is the dead Harper, minus Xzar who is imprisoned:
Here is Xzar, saved from ignominious instant-death, ALIVE AND STANDING ABOVE THE CORPSE OF HIS MURDERER, just like I said he would be:
That's all he'll say to me now as well. No more dialogue. Would have been nice if they'd snuck in something there but oh well.