Added: December 1, 2011
Senbonzakura reveals that Byakuya had sworn to kill Kouga, and had been searching for how to unseal him. Muramasa offers Kouga his power, but Kouga breaks Muramasa, stating that he does not need help. Byakuya and Kouga fight, but Kouga gains the upper hand when he distorts Byakuya's senses. Senbonzakura helps dispel the effect, though, and Byakuya manages to use the senkei mode of Senbonzakura's bankai on Kouga. As Byakuya notes that Kouga's failing was refusing to trust his zanpakuto or anyone else, the two charge at each other, with Byakuya killing Kouga.