Dave Grey,
Good correction here. He's had a couple close calls and I may have blurred them together here. I'm going to provide my source quotes so that it's a little more accurate than my first description. I have NOT researched the incidents farther than the outside magazine article I read casually two months ago. Admittedly Killian is doing cool stuff, but I thought the SAR concerns on his risk taking were worth forwarding.
http://www.outsideonline.com/fitness/running/trail-running/FKT-Up-Kilian-Jornet.html
http://www.rockandice.com/lates-news/kilian-jornet-and-emelie-forsberg-rescued-from-frendo-spur
http://www.theskichannel.com/news/20120618/world-champion-ski-mountaineer-stephane-brosse-suffers-fatal-fall-on-mont-blanc/
Frendo Spur incident 2013
"They called for help, and a pissed-off rescue team rappelled down and got them to safety. “I’m very angry when I see the continued rise of sneakers despite our requests,” the rescue chief fumed. “Mountain practice must be undertaken with adequate equipment.”
Mont Blanc 2012
"Jornet was grateful for the help, but he has made a habit of ignoring such warnings. In 2012, he was inches away from his idol—Stéphane Brosse, the legendary French ski mountaineer—when Brosse fell to his death as the pair attempted a speed crossing of the Mont Blanc massif."
Mont Blanc 2013
"Jornet bounced back from that tragedy by going even higher, lighter, and faster. He recruited another Frenchman, Mathéo Jacquemoud, for a speed attempt up and down Mont Blanc in the summer of 2013, but this time his partner suffered minor injuries when he fell into a small crevasse on the descent. Unable to keep the pace, Jacquemoud told Jornet to race on alone"
To be clear, I think these guys are incredible athletes and I understand that incredible athletes are always often going to push the limits. I definately defer to to these guys huge experience base. I'm posting the SAR teams concerns because I think they warrant consideration for any weekend warrior like myself on the BPL forums who might be modeling their set up after the extreme setups these guys were using for speed trials.