I've said it many times. There is a myth that all, or even the majority of bullies are soft inside and will crinkle if ever struck back. Sad truth is that too many are powerful sadists that get their jollies picking on those who are weaker.
I've posted it before, but I'll post it again for your benefit. I remember a kid at school who's father told him how to deal with a bully. They carried him away, moaning, barely conscious with most of his lip literally torn off from repeated blows. He was honestly never the same, physically or emotionally.
Sounds like the father had read ‘Ender’s Game’ recently.