of the canyon to the next. >> as eric falls, his life really does flash before his eyes. >> my thoughts go to my life, what i had accomplished, what i had done, my thoughts go to my family, you know, thinking i shouldn't see them again. >> hey, you okay? >> and he's feeling a searing pain. >> what caught my attention was the sound of the rope. >> at this point, i can feel the burns on my hands as i'm trying to stop. i hit the side of the wall with the back of my head right here, and i believe that that knocked me out. >> you hear one hit, you hear the second hit and then you hear the final thump. in my mind, i'm just wondering what just went on, what happened. >> david scrambles to the canyon's edge and peers down. >> i got into kind of panic mode.