For many people, seeing a Frenchman dressed as Santa Claus on a motorcycle usually means that Cirque du Soleil is in town, so be extra wary and trust nobody. This time, though, Motorcycle Santa is something of a hero, chasing down a terrible hit-and-run driver.
The motorcycle Santa in this case seems to be biker/Youtuber Chris RS, who dressed as Santa (and somehow affixed that Santa hat to his helmet remarkably well) just so he could drive around as Motorcycle Santa and wave to people. No biggie.
As he was tooling around spreading holiday glee, Chris RS happened to see a driver in a Renault Clio run right into a woman, who was knocked to the ground.