Abu Jandal was Osama bin Laden’s bodyguard before being arrested and repenting. His brother-in-law Salim Hamdan, held in Guantanamo, awaits his trial, which will prove historic. The Oath, the second part of Laura Poitras’ trilogy about the United States post-9/11, is a gripping political thriller interweaving the fates of two men once involved with Al-Qaeda, for which Kirsten Johnson holds the camera.