Might the Avignon Papacy here have an opportunity to further cement its position on the moral high ground? If the Roman Pope does not explicitly and directly condemn this brutality, made all the more shocking by the rape and murder of an Empress, Avignon might have an opportunity to condemn it in more general terms.
Avignon could use this event to propose formal moral laws of wartime conduct and obligations of soldiers, their commanders, and armies in general--at least toward civilians, and particularly regarding women and children. Obviously this wouldn't be a renaissance Geneva Convention, but even in a limited sense it could form the foundation for international laws of war that go further.
Now, from a purely pragmatic and diplomatic point of view, it serves to humiliate the Roman Papacy and elevate the standing of Avignon and those in communion with it. More importantly, if Avignon can get Constantinople and the other orthodox powers to sign on, it makes supporting the Romans against Venice much, much easier; not only would the Romans be the aggrieved party, but they could be described as more civilized and righteous than the decadent and increasingly barbarous Rome and Venice.
Avignon probably is going to find that sort of mercy to be a hard sell with Theodoros, but if it brings concrete support, maybe that's enough.
The boy shrugged. “Kill them anyway. God will know his own.”
Harsh... But in this era, after what happened, who could be surprised?
I think I can picture how all this might affect Andreas' personality. He's grown up with at least a couple strong women in his life--His mother, and his sister Alexia aren't exactly demure, passive ladies of court. In Smyrna, he saw his mother violently raped, but that she never stopped fighting.
When he was taken in by Nazim, it was another demonstration that people could be brave and kind, even ordinary people. Nazim's point about them all being children of God also seemed to make an impression.
But it's Andreas' reaction after Nazim is killed that stands out to me. When he realized what they were going to do to this woman and her daughters, his instinct was a protective one. He clenched his fists, stepped forward, and was going to fight. When it turned out he didn't have to, he remained not merely protective, but gentle and respectful to the woman in a way that ordinarily would be far above her station. Once at the university, Andreas also managed to be both forgiving and pragmatic to his own protector--He didn't feel betrayed, and understood the situation.
It comes down to the fact that his experience showed him the importance of strength, and the need to have it in order to protect those you love and the innocent that depend on you. Tempering this is of course is an icy pragmatism in place of mercy.
As Andreas grows up, I'd imagine he would show great loyalty and kindness to those who have done so to him, and those he loves in particular. Outside that charmed circle, people might as well be animals or tools--you don't abuse a useful thing, but neither do you need to show it warmth. Woe betide those who betray him, or hurt those he's warm to though, because I don't doubt he'll feel the need for disproportionate revenge to make a clear point, and absolve himself of his guilt for not protecting them better.
One thing about him that may or may not extend to other aspects of his personality and behavior... Andreas saw his sister and his mother violently gang raped in front of him while he was helpless. I don't think he's apt to tolerate the same kind of behavior from his own soldiers, or anyone else for that matter. Even if he doesn't experience horrible nightmares or flashbacks, seeing his sister or his mother in the eyes of a raped woman is
not going to let him ignore it. Summary judgement for his soldiers, perhaps, if they break discipline in such a manner?