Kronen and Kunugi would have probably fought for some time to an eventual draw. As it stands, Kunugi is almost out of ammo, so he takes the opportunity to flee when the fight betwen Juuzou and Seven distracts Kronen.
That’s just as well; I’m here for the Gunhead Fight. Unfortunately for Juuzou, Seven and Pepper are rather effectively demonstrating the advantage of a gun having a shooter, as Juuzou is soon beaten down into a corner.
Juuzou recalls that his own Hands once gave him the choice of whether to carry out the mission to eliminate the other GSUs. Like Pepper, he chose to do his duty, in the absence of anything worth fighting or dying to protect.
In what may be the first evidence of nuance in Pepper’s character, she actually seems to lament the fact Juuzou won’t join her. She considers not wanting to die to be what makes people human, and can’t fathom why he insists on dying rather than joining her and living, even if it’s shameful.
Pepper decides to give Juuzou what he wants, but Seven is stopped in his tracks by Kronen, allowing Tetsuro to use Harmony on Juuzou. Tetsuro remembers Juuzou telling him never to use Harmony on him again, but he also told him later that his choices and his worth are his own to determine.
Tetsuro choses to save Juuzou, and the only way to do that is to become his Hands, at least for the time being. When he hacks into Juuzou’s sub-brain, he finds a pedestal containing Juuzou’s trigger, and Juuzou’s voice begins to guide him through his formative memories.
I say formative because even here Juuzou doesn’t remember anything about his past prior to becoming a soldier and GSU. He does, however remember the mission to destroy the other rogue GSUs. We get to meet Twelve, who has a big pot belly and drinks sake from a dainty bottle rather than smoking cigarettes (back then Juuzou simply administered the drugs with an inhaler).
Twelve tells Juuzou that he and his fellow gunheads are tired of war and simply want to live their remaining days in peace, and to have a bit of fun after so much toil. He seemingly convinces Juuzou, who gives Twelve an escape route. But Juuzou simply led them to a spot where he could take them all out from a clock tower—an appropriately noir-y venue for betrayal.
It was there, after he had blasted to smithereens the people who considered him a brother, and heard the mocking comments of his fully human handlers who call him a “lunatic extended” that a switch flips in Juuzou. All this time he’d been insulating himself from blame and regret because it wasn’t his hand on the trigger.
But Juuzou wasn’t—and isn’t—an inanimate gun. He’s a gun with a human soul and personality, capable of making his own choices then and now. He chose to let his Hands use him to eliminate his brothers rather than letting them go. When he realizes that no matter who pulled the trigger, the decision was his, he snaps.
This is the first step on the road to the remorseful Juuzou we know, a Resolver living every day trying to atone for the red in his ledger. He’s always felt both he, the people in his life, and the world are better off if he never had a Hands again. But it’s not just his choice anymore, it’s Tetsuro’s too.