The side shot they highlighted on tv showed he was in the small ring. You can see the chain lines go below the large ring outline.

After he popped the chain he tried to move the front derailleur outward (driving the left shifter all the way) to get the chain back up to any ring but Bob guessed it went all the way over the big ring. Then when he fixed it the first time you can see before he got his feet in the pedals they spun backwards and popped the chain back off. Just a series of bad situations.

At this time I don't blame Red but as soon as I can get on my bike I'd like to see how many pedal revolutions it takes for the chain to switch cogs. If it's less than two then either Andy was putting on so much torque that it prevented the shifter from moving right away or something mechanical didn't work right at the worst possible time. Cheers