The "impact" looks more like he was trying to hold the car in place with his hand, which would explain why his phone camera image suddenly jumps at that point. She doesn't appear to have hit him at all, rather he leaned forward and put his hand out like he was going to force her to stop, and given the mass differential between himself and a Honda Pilot of approximately 22:1, he was shoved backward instead. Had he not done that, it sure looks like there would have been no contact between him and the car.
His first course of action was to try to physically restrain a 4,500 lb. vehicle with his arm. When that failed, his backup course of action was to fire three rounds at the driver's head as she drove past.