its a psychological thing with bullies. when their victim stood up for themselves, or more accuatately, is strong (mentally) and confident in themselves, bullies lose it. Most bullies are insecure and weak when alone. Skykar played a pull push game on him by feeding the rumor and showing it to that black haired guy (who caused the rumors). And cause most of Skylar's friends wont believe it true, the black haired would be ridiculed when its found out that he started the rumors. So yeah, the technique skylar did was a way to shut him up. And there are just people, in general, that just has this air of "no one can bully me" smth like that
why was he silence so quick?