. >> reporter: waiting for backup, officer ben tarahill makes a move, holstering his gun so he can disarm. >> i'm not doing anything! >> step out. hands behind your back. your other hand behind your back. >> reporter: turns out there was a second gun in the back seat. with both drivers and cops packing heat, four loaded guns, three tense minutes. finite amount of time but infinite ways this could have turned deadly. traffic stops are always a dangerous intersection of unknowns. but with our country at a crossroads, grappling with issues of race and justice. videos like these going viral. the circumstances disturbingly similar. >> please don't tell me this, lord, please jesus, don't tell me he's gone. >> reporter: a police car, a camera, a person of color. the traffic stop has become a flash point. >> they are here to sals nate us! >> yes, they are! >> they are here to kill us! >> murderers! >> because we are black! >> reporter: diamond reynolds was in the car when her boyfriend philando castille was shot by police last week, his tragic death live streamed on facebook, began as a traffic s