@Uthred @bvdaf As my man Kazuma once said:
"I am an advocate of TRUE gender equality, a guy who has no problem doling out a drop kick to a female opponent."
ANYONE, regardless of gender, race, age, what-have-you, that decides to bully, torture, and physically assault someone MUST do so with the expectation that they risk the same or worse being done back to them. Being born a woman isn't a free pass to be an abuser. The police, the school, her parents, literally every authority figure in her life decided to encourage and support her vile actions. Thus, there is LITERALLY no choice but to handle it personally in order to protect themselves and their loved ones.
Her being a woman got her a free pass after the sister asked him to not hurt her, but she basically said she was going to keep going, and do FAR worse than ever before. That's literally threatening to maim and/or kill her. Yeah, she doesn't deserve to get a pass any more. She never fucking did.
PS: This chapter sent this comic from a 9 to a 10 for me. It legit handled things perfectly to get the right level of payoff while keeping the MC away from the vengeance-obsessed edgelord trope that's quite common in these stories.