Very informative thread from someone who claims to have worked multiple security details as part of a local law enforcement attachment. In particular, he addresses the 3 perimeters of security, and the abrupt change in the line of sight from the counter sniper in that video everyone has seen. Tl;dr, his money is on the security failure happening with the local LE attachment, and not the USSS.
It appears that this sniper had him in his crosshairs but did not shoot, but appeared to readjust hit site and then the shooter fired 5 to 7 shots. The local law enforcement and the Secret Service dropped the ball here. there are multiple videos out now that show people trying to tell law enforcement and the Secret Service that there is a guy crawling on the roof with a rifle, and law enforcentment and Secret Service was like duh…what you talking 'bout??? Everyone of the law enforcement and the Secret Service who were there near the building that the shooter shot from and did nothing needs to be reprimanded or better yet fired. They did not do their job!!! Incompetence of any kind and level should not be in the Secret Service. My friend who is the head of Secret Service should be on a VERY hot seat right now. The shooter could have easily taken down that Secret Service sniper while he was fidgeting around with his rifle and standing out light a sore thumb...