"if you want to learn serpent breathing, be quicker. you can't be slow, no matter what," he informed.

you're his tsuguko. he said he didn't need one, yet took you in as one. right now, you're trying to learn serpent breathing. the breathing style that he created. as he is the serpent hashira. he's..very tough on you. he does give breaks every now and then, but doesn't make anything easy for you.