That's an amazingly cool vid. Robbie's been turning out some quality stuff for years now but that's definitely up there!
People have been riding bikes and quads over water for many years, snow mobiles too, even ethanol fuelled 4x4 monsters in Iceland but this is the first time I've seen anything like it in the waves. As for being run over by an MX bike in the line up, LOL! I wouldn't worry too much, it'll take a ton of talent and a good deal of support for even the most gifted riders to achieve.