Anyone think maybe he derailed the chain to coast the downhill? I've seen some people just unclip... but at some speeds, I'd MUCH rather have the pedals stopped.

If there is a LOT of decending coming up, and you've just mashed a hill... I think I'd take the time to coast, and leave myself a stationary pedal to balance on.

(BTW, I have no knowledge of it... it just makes sense to me)