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My armchair analysis guess is that he might have slipped off the front of the saddle. Unexpected change of weight on his arms made him swerve. I know I've been close to doing it at the end of a race a few times.
They probably wouldn't be too quick to admit that, and the bike looked fine (as far as I could see in the few seconds afterwards). I hope they announce the reason whatever it was though
Any idea what happened? Just seemed to lose the front end