>> yeah! >> immediately after the stunt, christian tries to explain why he took on the challenge. >> translator: we create contrast in our lives, so that for things to be really great, we must also experience hell. standing on that line is hell. it's damn good to come home and sit on the sofa and relax. >> be careful. oh. oh, no. a mountain biker plunges head over heels down a rocky cliff. >> it's a hard to describe experience when you think you see another human being in the process of dying. >> january 1, 2004, chorizo gorge, southern california. for experience cyclist bill and