go ahead and leave the scene without any incedent report could make a judge think that the rider was wiling to accept the situation
He's got better than a report, its on video. And who would he ask to do the report? The same officer who hit him from behind and blamed him for it? Not sure that would've turned out in his favor.
That's just a tough situation. I'm not saying I would've handled it the right way, but I think he did.