"On July 7, 2016, hundreds of protesters gathered in Dallas after the shooting of two black men-Philando Castile and Alton Sterling-by white policemen. One hundred Dallas police officers stood guard. At around nine p.m., a gunman opened fire into the lineof officers from behind. Five were killed and a dozen more injured. Senior Cpl. Larry Gordon, a black twenty-one year department veteran, managed to keep the shooter talking, in part by bonding with...