i would nominate the guy for a darwin award...but it appears he's ok. i hope the person he fell on is ok.
it appears the person who fell hurt their shoulder, while the person landed on, had a head injury.
http://www.usatoday.com/story/sports/nfl/bills/2013/11/17/buffalo-bills-ralph-wilson-stadium-fan-falls-third-deck/3622855/