Need to see another angle to really tell. If you don't know, drivers Rev their engines in Sprint Car racing to basically say fuck you. I think that is what happened and Stewart misjudged it and clipped the guy.
I think Stewart tried to scare the guy and misjudged it. I'm a NASCAR fan and Stewart is a hot head but I don't think he meant to actually hit the guy. Will be interesting to see if NASCAR allows him to race today due to his mental state. I'll be watching the race and will let you guys know since no one here watches NASCAR.