Bronson saw Hickey shoot JFK.

[Marjan Rynkiewicz]

I think that the AR15 had a right hand twist.
If the nose of the hollow-point slug contacts JFK's skull at 6 o'c on the slug then the hollow point will i think suffer more initial damage at that 6 o'c sector of the nose.
During the slug's say 6 inch trajekt through the brain the slug partly disintegrates to say less than a half of its original 55 grain, & slows to less than a half of its initial 3200 fps, & veers upwards, & tumbles upwards.
The more damaged sector of the slug twists from say 6 o'c at entry to say 12 o'c at exit, rotating clockwise (right hand twist) a half twist.
Then after exit the slug tumbles some more & hits & cracks the windshield just left of the rear vision mirror, having veered 6 deg in JFK's head.
The slug then ricochets back & down & up off the front seat (or up off the dash)(or the floor) & then out into Elm St.
I mention all of this koz i am thinking about how the twist of the remnant slug during its trajekt through the head might aid the 6 deg veer, ie based on the orientation of the more damaged sector magnifying the veer in some way.
That there 6 deg of veer is a big ask (for a hollow-point) in only 6 inches, & needs all the help it can get. Still thinking.

[Marjan Rynkiewicz]

SSA Hill had jumped offa the running board & was hitting the tarmac when SSA Hickey accidentally fired his first shot of his 4 shot auto burst of his AR15 (this first shot probly wounded Tague).
Later Hill was galloping & almost level with the front wheel when Hickey fired his shot 4 at Z312 (which hit jfk in the head & cracked the windshield).
So, it makes sense that Hill did not hear them there 4 shots.
With hindsight Hill could have turned around & reached over & grabbed the barrel of the AR15 to try to save jfk (instead of jumping off).
But otherwise there was nothing that Hill could have done.
SSA McIntyre who was standing behind Hill was in the prime pozzy to see Hickey shoot (& we see in Bronson that McIntyre was indeed looking at Hickey).
Anyhow, SSA Landis (who was standing on the right hand running board) is now today the only SSA still alive.
And he knows the truth.
They all knew.