Nergal: Morphs have no quintessence. I've no use for a damaged puppet.
This is right before he kills her for pretty much no reason.
She's a morph. How she somehow remains completely unaware of that fact, and furthermore shows all the emotions morphs aren't supposed to be able to have, is another unexplained, likely impossible to explain aspect of the game just tears more holes in FE7's story. Granted, compared to the bigger holes in the story, which have grown so much there's almost nothing left, it's hardly significant.
Why would Nergal care about the begging of someone who had screwed up more than enough to warrant death by his group's rules?
If Nergal used up any significant amount of energy in that area attack at all, why did he do it? According to Athos, the only reason they survived was because Nergal didn't want to kill him, and that's supported by what he says later (despite making no sense), so why would he expend so much energy (and when he had so much more he could also expend) on an attack he had no plan to make work?