What makes you say that?
From above, Crooks, the podium and the impact spot on the railing at the corner of the stand line up pretty well, and the angle of travel is about 45 degrees to the line of the back railing, which could make the puff look as though it was coming straight down that line.
On the video where Jeff Ostroff discusses the bodycam of the Butler cop M500 010482, two people are visible on the roof within yards of each other. Jeff only sees the second one, but someone on X has noticed the other, who is only visible for about half a second.
At one point Jeff slows it down, and you can best see the first person at 4:17, if you play it at 0.25 speed. Look for something like a telegraph pole at the far right of the picture, sticking up above the building. Just to the left of the telegraph pole you see a brief glimpse of him. Continue watching and you'll then see the other person whom Jeff points out near the same telegraph pole. Might be easier to start there and then go backwards.
https://www.youtube.com/watch?v=qBy7QjiDcLo&t=249s