For a moment, Hanzo sounded as though he regretted his actions. Something about that burned - anger, frustration, hurt. Pain. It was painful to hear, painful to see him just... sitting there, apparently ready to accept this.
No. Death wasn't what Hanzo deserved. With a hiss, reluctant and pained in nature, Genji removed the sword from his neck and sheathed it in one swift motion before he could change his mind, feeling the curiosity of Soba poking at his consicence. She thought this was a good thing, Genji thought it was... shameful. On both of their parts, truly. He didn't have the strength to enact his revenge and Hanzo would barely look at him, let alone fight back, justify the battle that Genji needed to prove himself worthy in his mind.
He side-eyed him at the talk of his sword, that he had... hung it up? Maybe this was one of those things he wasn't supposed to know. It only served to anger him further, somehow, how calm he was.
"You don't deserve to die," he decided eventually, unsure whether he would regret this or not. Letting Hanzo go. Knowing he was out there in the world, existing, breathing where Genji only had half of a lung left to do so with, having drowned in his own blood so long ago. "You made it as painful as possible. Did you know that, at the time?"