Sprint cars are dangerous things. And the dirt tracks are super lose. The car might have (likely did) just lost grip when he was trying to turn, and he hit the guy. It's a sad thing that happened, but I don't think he was being reckless, and I don't even thing he was trying to scare him. That guy put himself in a scary situation because he was pissed he crashed. A crash that was his fault as he was the one trying to pass.