mountain biker cedric grassia went out mountain biking off the coast of mad gas gar. very simple, flat section of this track they're on. nothing extreme. cedric is a champion mountain biker. whup see this, actually you're going to think that's pretty ch. >> oh, shoot. >> did you see it? >> whoa. whoa, whoa, whoa, where'd it come from? >> oh, my god. that's dangerous. >> what is that? >> see it? >> sen trick punk teared his femoral artery. he's bleeding out rapidly. cedric trying to put pressure on it himself. his buddies riding with him thankfully think fast and begin to put pressure on this artery. but you can see the blood flowing out of his body. this guy with the helmet cam putting both knees into cedric but cedric starts to realize how severely injured hi he is. >> what happened? >> hard to say. not sure what actually caused the injury. >> when he's coming to terms with his mortality, you see emergency workers start to show up. they begin to stabilize cedric. it's incredible that he survived. and it all thanks to his friends that were nearby that fought quickly to