Forty years after ‘napalm girl’ picture, a photographer reflects on the moment that might have been his

It’s difficult to explain to someone who has grown up in the world of digital photography just what it was like being a photojournalist in the all-too-recently-passed era of film cameras. That there was, necessarily, a moment when your finite roll of film would end at frame 36, and you would have to swap out the shot film for a fresh roll before being able to resume the hunt for a picture.