This comment just triggered an epiphany in me...
What if there IS NO escape route? Think about it. The area of the shooting last night was surrounded by motels. What if the sniper booked a room, took a "stroll" into the woods, lined up his target, and then strolled back into the motel. And all these "white vans" are just distractions. Perhaps he has accomplices who are always in a white van nearby with a cell phone. Not only do they tell him when the coast is clear to take a shot, but they provide a convenient decoy because people always remember a white van driving away from the scene. If the van is stopped, it is as clean as a whistle and the killer is already back in his motel room waiting for the coverage to start on CNN.