Let me highly reccomend a movie, called The Battle of Algiers. A french movie made in the early sixties. Not a great flick in terms of acting and a typical anti-war piece. BUT, about the most realistic depiction of urban guerilla war ever made, documentaries included. There was one scene, where two French gendarmes passed by a market. A revolotionary pulls a pistol from his waist band, shoots one in the back, takes two steps, drops it under a vegetable sellers cart, and calmy walks away. The rest of the crowd saw nothing. The article is correct, take one key shot, fade from the scene, and come back to do the same thing tomorow.
FQ13