Looks to me like the fat kid walked away after the fact. But yeah the pricks buddy looked like he was gonna swing after the fact.
Def gotta disagree here. Had to be the pricks friend who was doing recording and he wanted to show off to the 2 girls in video as well by picking on the fat kid. Bigger hint to the fact is the kid walks direct back to the camera after he gets hulk smashed to the ground.