SlopeGate: Secret Service Only Protects from Snipers on Flat Roofs?

On July 13th, President Trump was shot by an assassin, with a bullet taking a chunk out of his right ear. According to video evidence and eyewitnesses, the Secret Service snipers only learned about the shooter around three minutes before he fired his first shot. Within a few seconds of Trump being hit, the SS snipers fatally shot the assassin. The killing of a man armed with an AR-15 lying on a roof around 130 yards away was an impressive feat, earning praise for the brave agents from all over the world.