Muichiro was fighting Uppermoon 1, Kokushibo. Suddenly, Kokushibo was able to slice Muichiro’s hand, and Muichiro’s 2 legs.. The rest of the Hashira are trying to kill Kokushibo, while Muichiro was dying slowly. He was laying in a puddle of blood thinking about his life, his friends, his family (which are dead) and his duty as a Hashira.