forty_three
Stance: Goofy
There is a cell phone video that disputes this account of events, at least as written. The video is from someone on the ground near the shooter showing him focused and calm, lying on his stomach and taking the time to aim. Then firing off five shots before the video cuts out. In the background you hear at least five different voices yelling to police that he's up there.
There is another that shows him crawling across the roof slowly from the back. It must have taken him a while to cover the distance of the whole roof.
Not sure why officials would claim they knew he was there, engaged him and chickened out when none if it appears true.