 where he was able to climb up with an AR-style rifle and take a clear shot less than 400 yards away. That is the burning question. How did they let that happen? We do know that there was a local sheriff or a local sheriff officer or deputy that did spot him, and he tried to climb up on top of that building to stop him but fell off when the shooter turned and pointed his gun at him. It was just moments later that he started firing those rounds. So that is the big question for the Secret Service.