Mark hanging on for dear life

On the final ridge of the Dufourspitze, coming from the Grenzsattel. Mark is climbing around a large rock, with hundreds of meters of air below his feet. However, it's not as dangerous as that might sound, for he's roped from two sides, I've got him on this side, Al on the other, and in addition we've put the rope around the rock as well. And these rocks are, well, rock solid. 7 July 2013.