The point is that at 400 yards he could have set up with a tripod using a real sniper rifle and good scope and not been rushed.
You don’t need military training to hit a target with a setup like that. And apparently, the SS doesn’t protect against long-range sniper attacks! What they should be using for outside events is what the used with Obama a large 3 sided wall of bullet proof glass.
They use infrared to look in the trees. I’ve looked thru these devices before, they are amazing. Trees are naturally cool and humans are 98.6 deg F. In the winter, when there are no leaves, the problem is even simpler. Buildings with windows are the bigger issue, each one should have local LEO patrolling those. You can see clearly every deer and other animal in the woods during the day!!