A few years ago I studied screenshots of the Bronson film (the long shot where a guy is falling backwards with a long thin object pointing up. But it was suggested to me that the line was just a artifact or something. I had blown it up somewhat and it was quite grainy. I have files of those screenshots somewhere.
But that close with an AR-15? He would have surely really lost (his) face.
I can see a say AR15 in every frame.
I have goodish individual pix of each frame i think (probly same as yours).
It blurry, & we have 4 adults standing on the north side, plus the 2 agents standing on that running board, & we have 3 adults standing on the south side, plus 1 agent standing on that running board, so thats 10 adults standing somewhat eclipsing the 6 occupants (including Hickey sitting hi up on cases on leftside of rear seat).
But i will get there eventually.
I worked out that the freeze frame touted to be at the same time as Z313 is actually at Z319, & then i found that Dan Roffe says Z319 also. Thats a good start. Still thinking.