That poor bloke was in over his head. He was going to crash no matter what group he was in, just a matter of time. You could tell by his feet that he wasn't going to get off the bike. His feet are hanging off the front of his rear sets like a duck. When you see that it's a sure thing the rider is not prepared to get his bum off the seat.
I'd also bet the bike was one or two gears too tall for the corner. Spin the tire at midrange and it's very hard to catch the spin before it's too late. That bike didn't pissaround, it tossed his butt quick!
My guess is he has had no training. However, he just got a bit of education the hard way. What's that old cliché "Speed without Skill"?