The air is crisp. Tension is high. Lindsey Vonn is about to take her final ride in Milan, competing in the Olympics at an age few skiers ever reach. Coming off a fresh ACL tear and years of physical wear, the crowd is nervous. Can she beat the odds one more time? Her first turns are solid. Then, as she launches, her right arm catches the gate. Her body twists midair before slamming into the snow. She is left sitting in pain before being airlifted off the mountain. Vonn is one...