Notice in Dave's video at 7.19 all of the security (having finally climbed through the fence) is focused on the roof of building behind where Crooks was, training their weapons up there. No one is going near Crook's building at that point.
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That would be this building and roughly the area between the two sections of it that security is point their weapons at (red arrow).
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What about a sniper on the roof approx. at the location of the blue arrow, having gained access from that grassy area in between the buildings?
Yeah, those cops, weapons drawn, are frantically using
pallets to get up on that roof behind Crooks ASAP, two minutes after the shots were fired. I've marked where they are here:
Watch what goes on there from 7:10 on
Dave Stewart's video.
Pallets! They're sure the action is there and aren't waiting around for a ladder to get up to that specific spot...
At 7:44 one of them, who appears to have emerged from inside the building, runs out into the parking lot - backwards, weapon ready - in order to get a better view of the roof... of the building
behind Crooks:
This new theory fits with my initial assumption that any second shooter would have to have the trajectory of his bullets 'masked' by closely following the patsy's.
If the second shooter (or team, if there was more than one of them) is on the roof behind Crooks, then shot #9 could have been one of them 'wasting' Crooks after he'd fired off his 5 'wild' shots. If it's the final shot that hits Crooks, it's unlikely he would have remained in his prone position, or stopped firing.
More likely, he dropped in the exact spot where he took up his firing position because he was shot dead immediately after firing off his 5 rounds. By then, the sniper team behind him would've realized they'd missed Trump, so they let Crooks fire a barrage, then 'cleaned up', and took off downstairs and into the AGR complex to assume position as 'regular SS guys who are where they are meant to be'.
Shot #10 comes in about 8 seconds later from the CSU on farm building #14 behind Trump, far too late of course, but maybe it hit one of the 'second sniper team' as Dave recalls hearing over the police radio that "there's blood in the bathroom."
Now we also have a plausible basis for a cop to have been boosted up to the roof-line prior to the shooting, only to fall back down because he was spooked by "the shooter pointing his weapon at him just a few seconds before the shooting..."
In Dave's video, we don't see any cops being boosted up to the roof-line of building #6 (Crooks' building), so that incident probably took place at the building
behind Crooks, where the cops were focused immediately after the shooting.
And anyway, that cop wouldn't have been spooked by skinny Crooks. He
would have been spooked by the sight of one of two big guys turning his weapon on him, while his partner remained crouched in position to take out Trump just seconds later.