The camera cut away from her, but it should have stayed on her. Eight Belles had run herself half to death yesterday, and now the vets were finishing the job as she lay on her side, her beautiful figure a black hump on the track. Horses don't just fall down like that, you thought, as NBC flitted away, cowardlike, from the sickening picture to the more appealing image of the Kentucky Derby victor, Big Brown. There is no turning away from this fact: Eight Belles killed herself finishing second. She ran with the heart of a locomotive, on champagne-glass ankles,...