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There is, but if it's the final descent into the finish, I don't think you can expect GC riders who have struck out to make time gains to neutralise the race while they are probably getting all sorts of conflicting information over the radio.
This Friday and next Wednesday are similar finishes - if it's raining there will no doubt be plenty more dizzying chat if you have the GC race taking advantage of errors, unforced or otherwise.
Dan Martin is right that the race organisers have got what they wanted. Favouring these much more unpredictable finishes over the typical HC summit finishes does seem to be making for a more exciting race. It is putting the riders into a situation where they will push to take risks to take time, though. I always thought it was crazy that there has been at least one downhill TT in a Grand Tour before. I guess wanting it badly enough is just part of what makes a winner.
Even if they were, the race was on by that point. That's just tough. Just like when Kruijswijk crashed in the Giro and Nibali carried on.