late august, 2014, this man became the face of isis. >> our knife will continue to strike the necks of your people. >> in a terrifying series of videos, he graphically demonstrated the brutality of isis. >> you now have 72 hours. >> he was nicknamed jihadi john, and identified by his accent as british national, mohamed emwazi. fast forward to november 12th. >> jihadi john killed on a city street of raqqah, syria, killed on the city street of the strong hold of syria by drones. >> it's a dangerous place for an asset. as i say, when you're thwarted in one direction with one particular discipline, you try to compensate for it in other ways. >> like operating from the