[She said a lot of things that Yasusada doesn't think a non-sword/sword-adjacent person would understand, honestly, but he will try and summarize anyway.]

...That they couldn't be saved without a cost, mostly. That the convicted person would have to prove their right to live through blood.

[He'd assumed, at the time, that she'd meant Vax would have to die if Percy wanted to live. After what happened, he's shifted to thinking that maybe it's simply about the will, the desire to fight for survival--but it's hard to say, in this place with its utterly different rules.]