Yeah, but even with those, seemed like they returned fire almost immediately. From the audio and video of them, the front sniper is looking that direction, sounds like 2 shots go off, he pulls away from scope to get quick spatial awareness to sight in, then engages immediately.
He saw either the muzzle flash or something because he appears to engage before the sound from the shot reaches the microphone on the camera.
That is incredibly quick reaction if they didn't have him already sited, even with all the equipment they likely have. So if you and I were tasked with, "How do we keep this from happening again?", that would be one of the places I would likely have some questions. Did we do something wrong there that violates our rules of engagement or do we need to reevaluate our rules of engagement?
My other questions would be on how that other roof with such a clear line of sight for a shot was left unmanned. If it was local LE responsibility, then in the future the Secret Service needs to send people out to double check and make sure instructions are being followed.