On further inspection it just looks like a puddle, in which case it is possible that the puddle's crater caused a slight precession in his front wheel - unrestrained at that moment - thus initiating the catastrophic chain of events which were no doubt exacerbated by exhaustion and complacency following his winning of the race.
On further inspection it just looks like a puddle, in which case it is possible that the puddle's crater caused a slight precession in his front wheel - unrestrained at that moment - thus initiating the catastrophic chain of events which were no doubt exacerbated by exhaustion and complacency following his winning of the race.