Renji, Oath of the Soul! Death Match with Byakuya

Renji travels to Rukia's execution area, and meets his captain Byakuya along the way. Renji ends up using his bankai to fight Byakuya, but his lack of experience with his bankai stymies his efforts. Byakuya uses his shikai to try and counterattack but fails and Renji reveals that his bankai is held together by his spiritual pressure. Byakuya uses his own bankai and attacks again, wounding Renji and causes his bankai to fade away. Finally Renji makes a last try and actually reaches his captain with his zanpaktou, but it breaks and Renji's wounds cause him to fall as the captain congratulates him.