Porte and Froome were perfectly candid after the race. At the start of the final stage Porte was in yellow and Froome was fourth, but only two seconds behind. They agreed that whichever of them had the legs would go for it on the climb and the other would block. Hd Porte gone with Froome he would probably have towed Tejay along for a while, still lost, but compromised Froome's chances of winning. As it was he was able to wait until Froome was sure of the win and then go away from the rest for a Sky one-two.
What's to understand? It was a brilliant team performance. The way Froome and Porte and Uran and Wiggins are climbing, I'm thinking the Tour is going to be mighty interesting.