Quote: Andy Gilder "The problem with the descent was the combination of difficulty and lack of any kind of margin for error or safety precautions in the event of someone getting it wrong. Vincenzo Nibali is one of the best descenders in world cycling, yet it caught him out on Saturday. If you're going to have a descent that tricky and made even more so by the shadows cast by the trees over the road, then you can't have six inch deep gutters on both sides of the road that will throw anyone getting it slightly wrong over their handlebars. It's like putting concrete walls with no deformable barrier on the fastest part of a Formula One track.'"
Nibali also fell in the TDF on a descent this year so maybe he has become a bit blaze about going downhill maybe he is no longer as invincible as he believes he is.
The points I was trying to make are: it wasn't the first time they made that descent IIRC three times during the race and the number of fallers were few. Thomas fell but that is not new for him last year he spent more time on his bum during the classic season than on his bike.