It was Tani that sentenced the Shinsengumi leader Isami KONDO, who had been caught in Nagareyama, to cruel punishments; beheading him and exposing his head at a prison gate, and for Tani, these punishments were revenge for Ryoma.
流山で捕らえた新撰組局長であった近藤勇を斬首・獄門という惨刑に処したのも谷であり、彼にとっては龍馬の敵討ちであった。