Thanks, and that was one of my questions too! Sometimes he just walks down - he's been climbing for 25 years and is like a mountain goat. Other times he does a self-belay, where you wrap the rope round an anchor (a stable rock or very large tree) so it's doubled over on itself. With both ends fed through a belay device and your harness, you can belay yourself down in a controlled way. Once you're at the bottom, you untie yourself and pull the rope back. Genius!