Russians record everything, especially in traffic. So, with that said, if you're going to get in an altercation with a fellow motorists, there's a better than even chance that if you get your ass beat, someone will post it to YouTube.
From the way it appears in this video, the guy on the big dresser, (a Goldwing perhaps) is riding the center lane beside another vehicle and tries to cut in front, or split the lane and gets into a verbal altercation with the auto driver, who jams the biker into the opposite lane, causing him to drop his bike. Once it escalates to this point, the biker does a little dance on the hood of the Toyota, resulting in a few punches being thrown. We say a few, because this fight was shorter than the 90 second knockout bout between Mike Tyson and Michael Spinks.
But at least the biker has his club brother there to help him... oh wait.. sorry bro.. I have a bad back.. I can't get involved..