Paul Greengrass revitalized the action movie by infusing his "Bourne” films with documentary-style realism, so perhaps it was inevitable that "The Cove,” a stunning documentary uncovering a secret dolphin-slaughtering operation in Taiji, Japan , succeeds by telling its tale with a Greengrass-style sense of kinetic urgency. Simply put, if more documentaries were executed with as much energy and style...