started. i was there tailgating with a group of veterans from usc and ucla. and as i was walking around the parking lot, i saw a big commotion. so i ran over to it. they had already started fighting by the time i got there. so i just whipped out my phone and started trying to get the tail end of the action. >> so this is all from your cell phone? amazingly enough, pretty good pictures. >> thank you. >> i'm hearing from our affiliate in l.a. apparently this started because tailgaters threw a football and hit a mercedes from other fans. they weren't thrilled about that. this involved quite a number of people. kyler, how did the crowd react? was anyone trying to break it up? >> there were a few trying to break it up. i think everybody was shocked. and then although i didn't see it when it happened, but there was a guy there with a knife. so i'm pretty sure a lot of people were pretty scared and kind of backed away after seeing that. >> at what point of the video did we see what appears to be a