It would have been better if he had shouted WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE! all the way down! 
Friggin' wouldn't I can assure you.
Happened to me on a much much smaller scale near the top of Snowdon on NYD 5 years ago.
Only slid 20' granted, and it was nowhere near as steep as that, but it was the most terrifying slide of my life as i saw all these jagged rocks racing up towards me.
It was ironically hilarious as onlookers shouted WWWWWWWHOA at me!

Well clearly yes, that's what I was
trying to do.