Robbie "Maddo" Maddison doesn't play by the rules.
It's not like he parks on double yellow lines or streams BBC programmes without a TV licence - Maddo just refuses to use transport in a conventional way.
You'd probably use a motocross bike to tackle tricky mountainous terrain. Not Maddo.
This ridiculous spectacle of DC's 'Pipe Dream' stunt is possible thanks to Maddo's modified bike: the front and rear wheels both have small pontoons attached to help spread the weight of the bike, but it's the speed of the paddle-covered rear wheel that keeps Maddo skimming over the water. Should the engine cut or reduce the rear wheel's RPM for any reason, Maddo would sink as quickly as... well, an idiot riding a motorbike on water.
Here's hoping his next trick involves turning bike fuel into wine.