After watching this incident, over and over. It seems some driver's were driving quite sedately, while other's (Black Mustang, silver Cobra) were hard on the gas. Driving on the track at "Speed" without a helmet, is not only Dumb, but very Dangerous. I'm sorry but the Cobra guy, should be "Slapped & Sterilized".
We have a "Unwritten" rule in vintage racing, your fault, you pay to have the other gentleman car fixed too. My $.02 Cheers Tom.