The downhill was interrupted for about a half-hour while Edith Miklos, a 21-year-old Romanian, was airlifted off the course by helicopter and later treated for a knee injury. Five-time Olympic medalist Anja Paerson, one of Vonn’s chief rivals, lost control on the last leap, sailing about half a football field before landing on her back, tumbling through a gate and sliding across the red finish line. Miraculously, Paerson was badly bruised but no bones were broken, and she wasn’t immediately ruled out for Thursday. Marion Rolland of France stumbled out of the start and tore a ligament in her left knee not 5 seconds into her run, years of work discarded in an instant.