There are three suspicious things - the guy with the orange hair actually SEEING the shooter climb, and then standing there pointing at him while the security team looked on.
The shooter was 150 yards from Trump, on a rooftop with a direct line of sigh of the stage. You'd think law enforcement would've stopped him at a security perimeter or something. Or at least, why didn't they have some people watching all possibly threatening rooftops. Or have some people ON all the rooftops?
Then there's the video of the security snipers who seem to be looking directly AT the shooter, but don't fire until he does. I'm not sure, that's what it looks like to me. You can see that the sniper's head pops up - it doesn't swivel or anything to a different direction. If the shooter could see Trump from 150 yards, I think it's more than likely that the sniper could see him, as they probably have the best scopes one can imagine. Maybe he didn't see the shooter climb onto the roof, and his tan camo was blending in with the rooftop?