It's interesting that there's some girl berating and trying to stop the videographer from shooting. The part where it gets really shaky she might be physically trying to stop him. It sounds like she's a student. She says "You're recording this and you're not supposed to be recording it" and then calls "teacher!". Is it against the law to shoot video in American schools, now?

I don't think it's against the law. But, in an interview the student w/ the cell phone camera says there is a "no electronics" policy at the school, which I imagine means he's not supposed to have his cell phone with him. There's probably also a policy about video taping in schools.