Sky are meticulous in their planning and I wouldn't be surprised if his late orders were " do enough to get ahead of Contador on GC, plug away but save something - you've got another hard day helping Chris tomorrow." Similarly , one of the commentators said he thought Sky had made a mistake with Porte dropping back too far to help in the descent but got dropped. I doubt if they made a mistake, probably cautious enough to think if Froome is descending at pace then having Porte behind him in case of a crash was a wise move. It's fascinating at this stage to try to think about the teams plans, particularly Movistar and Sky.