 I could feel my eyes getting wider. And I was paralyzed in the neck down. You come through it, you move on. I've broken it twice since. I nearly had my left leg amputated. I mean, it is a dangerous sport. Earning all those scars in the only Olympic sport where men and women are competing on equal footing. Welcome to the world of horseback riding. In this case, eventing. Or, as Spencer, himself a world-class rider, puts it...