I was expecting them to do a parachute jump! but I agree with Chris, what the safety hook was connected to most of the time was inappropriate and would probably have folded if it had his full weight thrown on it, that is if the hook didn't slide off beforehand.
Mind, I suppose that's childs play compared to the climbers who climb without ropes or any other aids, other than a bag with whatever it is they put on their hands, especially when they have to surmount an overhang, my blood runs cold and I'm imagining the abrupt stop at the bottom
Brian