>> it's a sight vaughn has never seen. but he's not immediately worried. he thinks the lift operator could simply back the chair up to the drop-off area that was much less steep. but that drop area is not as close as it seems. and what vaughn doesn't realize is that the boy's backpack is caught in the chair. the strap is around his neck and slowly choking him. >> you can see him just really kicking and struggling to try and get free. >> vaughn films the terrifying scene. the boy hangs on for more than a minute. then as the crowd gasps, the boy finally slips and falls the equivalent of three stories on to the hard snow. >> oh my god! >> it was just kind of like in slow motion, until he hit. it was a long ways down. >> the ski patrol is standing by and tends to the boy in a matter of seconds, but is the boy alive? and if so, has he suffered serious injury? >> i'm very amazed that i survived.