I don't get why Quintana didn't go sooner.
Yeah there's a chance of cracking and losing time, but even if that happened he wouldn't have lost time to Contador and Valverde, right now he's just to far ahead of them as a climber.
So basically he decided to play it safe so he was sure to lose no time on Froome and maybe even take 30 seconds. Which is pointless. I can understand being careful in week 1, maybe even in week 2, when there's still racing to be done, but on the penultimate mountain stage it's such a waste.