So, correct me if I'm wrong, but for zach's sake, this is my understanding of the sequence of events.
Dude and his family go for a drive, not knowing asshats are staging a spectacle. One biker deliberatly cuts him off and brake checks causing a non-injury fender bender. Other bikers start pounding the car and slashing the tires. Fearing for his and his family's life he guns it and escapes seriously injuring one biker in the process. Some bikes tend the wounded, others give chase. Eventually the surround the SUV drag the dude out, beat and slash him and leave him for dead. Cops finally catch up, transport him to the hospital, and and that's the end.