They did everything wrong.
How did he survive ? 130 yard chip shot, exposed him to fire all the way to the truck. They should have a trap door setup to go under & behind the crowd. That whole deal was a Charlie Foxtrot put together to GET a guy fragged.
I don't think the SS used their best to guard Trump, the FBI will lie and claim they did but then again, they will also claim the shooter was a Republican, NRA member, Christian, and returner of shopping carts.