they have fallen and maybe they're injured. i have to help them. i wasn't hesitating with what to do. go to that guy. >> riders are down and motionless on the ground as more bikes come soaring through the air. visher bends down to help a rider, his back to the circuit. >> i heard the crashing sound of metal over the tarmac and this is going seriously wrong. i have to get out of here. i just stood up, and i think two or three bikes at the same time and they torpedoed me. >> he's hit by multiple bikes and crushed against the safety wall in a blaze of metal and smoke. >> oh, dear me. that was horrendous. >> officials red flag the race as a half dozen riders lose control of their bikes and crash. >> i thought i have to change my life because my leg's gone. at the end they said, okay, it's still attached to the rest of the body, but it's terribly