I bet that kid was very easy to hypnotize into doing the entire thing. That is why the ladder the ladder was prepositioned. The gun was provided. The video games he played and the cell phones and the other tech around him provided the training and programming. Thats why a twerp was moving like a soldier up and around the roof and rifle.
It wouldn't be surprising if that actually was the way it went down. And all the while he was to naive to know they planned to kill him from the start after the President was hit. The cop that interrupted him on the roof created a situation with to much pressure for a lightweight kid to make the shot (thank God). After he fired, his fate was set.
