If Joran Vhane wanted to live, he evidently chose the wrong sibling for his loyalty-unto-death; not to mention the obvious flaws in his tactics. Admittedly the man had made himself a very capable defensive build, but imagine trying to fight by himself right in front of his Abyssal forge, with no DPS to complement his, again, very good tanking! Or any way to call for backup from the many allied forces nearby - or better still join forces with Minagho temporarily, proportional-to-N-square and all that! Really now, this is just nontrivially suboptimal and also why the forces of Hell will eventually win. Lawful Evil may have some flaws but at least it can manage to concentrate forces with those it has interests in common with, even if it despises them utterly.

But actually, Regill thinks Staunton's "he wanted to live" is doing Joran Vhane an injustice; certainly Vhane wanted to live, but he also had a principle that he valued even more highly, which he followed to its logical conclusion. Regill respects that. Unlike Joran's worthless brother. Not, of course, that respect meant so much as a centiround's hesitation before hooked hammer crushed skull, when they finally wore him down enough for the killing blow. That would be unprofessional. But it does mean that Regill takes some personal satisfaction in doing the same to the worthless brother.

Um this is all very interesting but Nurah does kind of want to live? Can she get some of that "unconditional surrender" she heard about earlier?

Sigh. It is not actually very obvious that demons are meaningfully able to surrender as Abramo's laws of war understood the term - but Nurah isn't a demon even if she does show up Chaotic Neutral to Aura Sight, and many of the enemy are perfectly ordinary human cultists who are maybe not strikingly Lawful but can follow a basic incentive gradient. Nurah isn't entitled to the protections of a uniformed combatant, of course - well, they don't use uniforms here, but she was just blatantly gathering information on his side of the front under false pretenses, not to mention the sabotage. 

Yeah well no demons ever enslaved me!

Yes, yes. He listens to her ranting for a moment, but - she is not actually a sufficiently established character that this sets up any sort of conflict. He has nonzero sympathy for people born into slavery into Cheliax, which sounds more like a hellhole the more he hears about it, and nonzero (large, negative) sympathy for former slaves who decide to take vengeance on the world at large and don't even have the guts to do so openly. The actual question is, what if any obligations does he still have to her under the laws of war? Is he even required to accept her surrender? She's plainly no sort of lawful combatant, he definitely doesn't have to feed the bitch her, but what does he have to do?

The words "Regill, kill her" tremble on his lips for a moment... but no, he remembers. She's still entitled to a trial before being hanged. Fair enough; they can arrange a court martial tomorrow. Given the evidence it should not take very long.