A seasoned Army sergeant makes a split-second decision to stop a possible bombing. Now he's stunned to be charged with negligent homicide. Sgt. 1st Class Walter Taylor's life collapsed in four interminable seconds in a dusty field in central Afghanistan. His convoy was reeling from a roadside bomb, his fellow soldiers were engaged in combat with insurgents — and a mysterious black car had just screeched to a stop in the middle of the firefight. Some nine minutes later, a black door opens. Second 1: A figure dressed in dark, bulky clothing emerges. Second 2: The figure begins walking toward...