Greg - The Sniper in the Window

New bodycam video taken on the roof of the building at the Trump rally in Pennsylvania miraculously identifies the sniper in the second-story window - who took pictures of the shooter from that window an hour before the shooting - was still in the window after the shooting. His name is mentioned in the video - Greg.

Question is, where was Greg when the shooter crawled up the roof in clear view of Greg's window?

Twenty to thirty seconds into this video:

Police Bodycam Footage of Secret Service Responding to Trump Shooter on Roof Released, Snipers Took Photos of Crooks Before Shooting, Drone Sent to Water Tower (VIDEO)