Oh! Well that makes sense.

[In a way. It's still one of the more baffling human inventions he's seen, but that's more of a why than a how.]

[Oh wait, no, he knows the answer to why. The answer is because it looks amazingly fun and dangerous.]

I'll have to start practicing if I want to go down a hill then. Which I'm going to do, because that would be much faster. I wonder if you could rig it to some Pokemon...