>> holy cow! >> the victim of this terrifying impact is 17-year-old professional biker evan. it was only five years earlier that his father bought evan and his brother their first bikes for christmas. >> the first years of riding, a family thing together with my dad. and from there my brother and i started getting serious and racing. >> in a short time span, evan starts collecting awards and even picks up a corporate sponsorship. >> i've carried on into national level in south africa and world cup race this year. >> it's october 9th, 2011. evan is riding in a 45 kilometer mountain bike race with team jeep. >> i was comfortable. >> as they raced through the woods, pedal by pedal and one of evan's teammates catches all the action on camera with a go probe mounted to the bike. >> i was just talking to my teammate behind me and i offered