 The shooter turned around, saw that officer peering over the ledge and pointed his gun at him. The officer let go of the ledge to take cover and save his own life. Gunman then started firing from the rooftop. That's when he was engaged by Secret Service and taken out. When asked if overall security lapse is what led to a gunman having a direct line of sight to Trump and if it was a failure, Sloop said it obviously was.