If everything was going the way it was supposed to, surveillance would have already seen the shooter walking across the field on the way to his vantage point on the roof. As soon as he hopped on the roof, he would've already been in the counter sniper's sights. As soon as the shooter's rifle was visible to the counter sniper, the trigger would have been pulled. Instead, you have a shooter that was on the roof for a whole 30 minutes before he fired his shots at Trump.

If everything was going the way it was supposed to, surveillance would have already seen the shooter walking across the field on the way to his vantage point on the roof. As soon as he hopped on the roof, he would've already been in the counter sniper's sights. As soon as the shooter's rifle was visible to the counter sniper, the trigger would have been pulled. Instead, would you have is a shooter that was on the roof for a whole 30 minutes before he fired his shots at Trump.