Nimi-san has gone against the Shinsengumi. To avoid anymore problems they want to get rid of Serizawa.
while the top gets covered with mud.
بينما يُغطَّى الجزء العلويّ بالتُّراب
quando la cima viene coperta di fango.
и рождается, пуская корни глубоко 
под землёй.