Shots fired at Trump rally, page-1695

This looks like a setup?

I appears, Crooks knew exactly where to go. It is also strange that most of the news footage is lying about the position of Crooks when he took the shot. The snapshot below shows the correct position of Crooks (the sniper) based on the bloodstains on the roof. This also shows that he is not visible to the police snipers who are on the roof near Trump - because he is hiding behind a tree. How did Crooks know this in advance? Also, both the police and security was notified by witnesses of the shooters presence and location almost 8 minutes before he unloaded on Trump. The security protocol says, if there is any threat whatsoever the Official should be immediately obscured from view of the threat and moves to a safe position. This was done at a previous Trump rally, but not this time?