Very impressive ride today and tactially quite brilliant. I was seriously concerned today that his crash injuries would catch up to him and he would loose minutes.
It seems fairly obvious that the reason he took up the pace on the final climb was that his back pain from the crash has basically seriously dampened his ability to accelerate and climb out of the saddle, therefore his limited choice to avoid being dropped is to sit down and tap out the highest possible speed he can sustain. This reduced the chances of the other GC riders attacking in burst which, as did happen in the last 500 metres, isolating Dan as he is unable to respond. Another indication of his kick not being there was his inability to stay ahead of Yates at the finish.
This is a real shame for him as, for example, on saturday stage he should be normally a good bet for the stage win, getting bonus seconds and putting another dozen + seconds into his near rivals. The last 600 metres are seriously steep and with Sagan and Valverde gone there is only really Micheal Matthews and GVA who are likely to contest.
The short video of him at the end of the stage posted on stickybottle strongly suggest its going to be at least another few days before he gets back his lethal final kick, which in a TdF that is evolving to be so close would have been invaluable and would have ensured that we would be talking not so much whether he can sustain his performance but whether he can win the entire race.