“Every year, movie studios plant flags on days they consider to be prime real estate to launch their planned summer blockbusters, warning potential competitors to steer clear or face destruction. Backing away from an intended release date is a sign of weakness. But early this month, two movie studios quietly made an inauspicious sort of history by doing something no studio had ever done in the history of Hollywood: They each moved the release date of a feature film to avoid getting trampled at the box office by a documentary.”