 She was screaming, there's a man on the roof. And then other people said, there's a man on the roof who's got a gun. And that was quite a bit before I walked onto the stage. So you would have thought somebody would have done something about it. Thomas Crooks quickly identified as a person of interest for his strange behavior near the metal detectors. A little more than 30 minutes before the shooting, Crooks is then spotted with a golf range finder, and officers begin circulating this photo in an effort to track him down. Yeah, look.