Okay, if this guy recording is legit, based on his talk it appears that he did, indeed, see Crooks. Some snippets from what he said:
in video 4:58 (time 18:14)
“…he’s laying down, next building over. Right after the gap. (S)he’s got glasses, long hair…You, Mike, I climbed the wall, and pulled my — (inaudible) right in front of him, he’s got a booth bag, he’s got a mag…(censodred/beep) AR, laying down”
in video 6:14 (time 18:15)
“He was on top of this building, the left one…”
in video 7:25 (time 18:16:25)
Radio: “We have a unit on the roof…”
What seems incredible is how amateurish the bunch of officers appear. They are gathering below the wrong building, wondering if and how to get up. Then, when the guy says that he was on the other building, the one to the left, they appear to have no hurry in getting there – then, as they get there, scratching their heads how to get up at the place where this officer recording fitst pulled himself up. It appears almost like they are stalling on purpose.
Why didn't this officer who saw Crooks, for instance, fire his hand gun and yell "Shooter on the roof!" or something? Not to mention notifying of this danger via radio? (ADDED: maybe he did, since we don't have audio for the first minute or so)
Either this whole bunch were total amateurs, or there was a deliberate effort to stall things.