Although Yan Ju felt so angry that he wanted to slap Helian Beifang's face, he didn't do it.
Firstly, although headhunting students was a commonly-seen occurrence in the great teacher world, it was still deemed as an improper act. If the news of him beating up someone else's student after his headhunting attempt failed, he'd be super embarrassed.
Moreover, Helian Beifang was a barbarian.
In Yan Ju's perspective, he was no different from a wild dog.
According to the Central Plains' primary values, beating up a barbarian warrior wasn't something to be proud of, let alone beating up a barbarian young man.
Because this action was like biting a dog back after being bitten by it. The act of 'biting' in itself was low class to begin with.
Moreover, a great teacher should convince people with their morals!
"You really don't know what's good for you."
Yan Ju scolded then swung his sleeve and left.