Garzelli has 9'20" at the top of the climb. If he stays away to the top of Fedaia, then Contador needs to get 20 points from Fedaia and Rifugio Gardeccia to hold the GPM - which he could only make by being 2nd on Fedaia and winning the stage (with Garzelli finishing outside the top 6).
Now Nibali is back to Contador and imediately on the front on the descent. Will be interesting to see if he tries to create a gap. At first glance it looked as though he was taking it easy though.