That was the only problem for me in that chapter, criticaling Kishuana enough to take him out...the terrible thing is that he's hard to hit...I suppose it was harder for me because I've never abused the arena in Badon before that, but I was finally able to do it. I just use my mighty Oswin for a near-guaranteed hit, have Marcus (I use him in this chapter just to get one hit on Kishuana) get him with the silver lance, and then it all relies on chance. Hector (usually level 20 at this point) has a 40-something or 50-something percent chance of hitting, and if he does, I use Lyn and her Mani Katti to try and get a critical. If everything goes perfectly, Kishuana goes down and I only have to worry about Aion bolting me for one turn...since Kishuana disappears after time I go for him first. I wouldn't even bother with him if it wasn't for 19xx, though. I like to get every single sidequest, I just consider it extra experience...