Let me start out by saying that I have the utmost respect for law enforcement. Having worked in public safety for a time myself, I know almost any situation can be very tense and nerve wracking.
That said, after watching this video, I can't help but wonder... What ever happened to "License and Registration, please?" That simple phrase alone would have proved that this kid owned the car and did not steal it.
Should the guy have stayed in the car? Maybe. But he was fully cooperative, with his hand in the air.