That's a bit much. If everybody went to jail for trying to make the opposite gender, jealous, by talking or walks home- a whole lot of people would be locked up.Throw the girl under the jail if the story is true.
This is a 17-18 yr old girl; it's not like she's a grown adult caught having sex with dude. For all we know, she could have broken up with the white boy and he decides to escalate out of his own jealousy.
Blame that white boy for brandishing a knife for that type of fight - and his friends for enabling it.