In 1975, cameramen did not follow players’ reactions. They followed the ball. Reaction shots like that one, so ubiquitous today, were largely unheard of. Then Fisk, the Red Sox catcher, stepped to the plate in the 12th inning of Game 6 of the World Series. NBC cameraman Lou Gerard, stationed in the Fenway scoreboard and assigned to track the ball wherever Fisk hit it, had a problem.A big, hairy, ugly, nasty problem.