When he kills hundreds of demigods in hope he still just a boy
Meeting Annabeth and the rest, he was initially apprehensive of Luke. However, the more time he spent with him, the more he realized that he was just a boy with issues and not really a bad person.
Percy Jackson: Son of Hades - Prince of the Underworld
As Byakuya, I naturally had high Reiryoku reserves now. Byakuya was a very fast Shinigami. His speed was not as fast as Yoruichi but he wasn't that far off. He was a master swordsman and hand-to-hand combatant. And with the fact that I was now a Kuchiki meant that I also had a lot of possibilities to learn new things.