The guy was using a harness on the most dangerous section of this hike. On the one I posted you'll notice a wire running alongside the wall, in one small section you can see a hiker unhooking his harness and hooking it to the next section of wire. What you don't see though is the guy filming the video ever hooking or unhooking any safety device. Thought he might have been hooked to someone else farther behind, but a couple of times he pans back the way he came...and you can see nobody else following him.