This is not luck. This is skill. How many state and federal resources were in the area today? Bet there were tons of helicopters on patrol, special teams ready to roll, and this guy/team just keeps at it with ice in their veins. I do agree with the profile about somebody in their 20's or 30's. This isn't a teen ager. My first guess is a trained islamist, second guess is a whack job ex sniper.
But if he's an Islamicist we'll never hear about it. (Of course, if he turns out to be some deranged home-grown hunter the loony left will be rounding us all up . . . )