It's the nightmare every photojournalist knows. You're at the scene of a major news event, something violent and fast and chaotic, but when it's over you're not sure you captured it. Jack Thornell knew that feeling better than most.
On a Mississippi highway in June 1966, the Associated Press photographer heard the blast of a shotgun and scrambled out of his car, clutching his camera. But when the dust settled, his felt not relief, but dread. He feared his rival had a picture of the gunman and he didn't. He thought he was going to be sacked.
