User blog comment:Goregutz619/HXH episode 138 discussion/@comment-14902757-20140720215848

This just came to me, how was Killua able to deduce that if someone tries to break Gon's vow, they will be dispelled or be killed? Does it mean someone already tried? Or someone must have told Killua of a similar incident? So what Gon did wasn't too uncommon?