Basically, Byakuya has just finished condemning his sister to death, and is walking away from the place, when Gin and Kenpachi show up. Gin praises Byakuya for his unfeelingness and Kenpachi scoffs at him (Gin) for his "fear of death." Kenpachi says that Byakuya is right for condemning his sister, because a troublemaker would tarnish a good family's image, and Byakuya replies with some sort of mean comeback about how Kenpachi wouldn't know. Kenpachi and Byakuya get angry with one another and prepare to fight when... GIN TO THE RESCUE! XD
Tags: Gin Ichimaru Byakuya Kuchiki Kenpachi Zaraki Bleach episode 20