in chapter 19, in a magic school he practice flying and handgag a girl when they think he is a ghost.
in chapter 36 there is a full treatment, at a certain point his marry his rival, unfotaly his little sister does not like her and after getting her class blackmails her older sister to help her to learn how to kill her brother wife, during the fake trail they make they tie up and gag a woman to spread fake info to the brother to buy time so she can learn how to kill his new wife.
chapter 19
chapter 36
