Details of the motorcade can be found in --Presidential Motorcade Schematic Listing by Todd Wayne Vaughn.
http://jfk.hood.edu/Collection/Weisberg%20Subject%20Index%20Files/M%20Disk/Motorcade%20Route/Item%2015.pdfWe are lucky to have UYB04 to UYB18 (B01 to UYB20 actually). This is the only footage-photo of what happened in & around Queen Mary at the time of Z313. All others focused on the JFK limo & incidentally got a small chunk of Queen Mary. Here is what i see in UYB04 to UYB18 ( i later included UYB01 UYB02 UYB03 UYB19 UYB20) .............
(1) Kinney (driver). Can be seen relatively well. Is looking ahead throughout.
(2) Roberts (sitting next to Kinney). Hidden by Kinney. We can see the top of his head at times. Reactions not vizible.
(3) O'Donnell (sitting in left jump seat). Hidden by McIntyre.
(4) Powers (sitting in right jump seat). Hidden by McIntyre & O'Donnell.
(5) Hickey (semi-standing in left of rear seat). I will give a detailed description of Hickey's actions later. We can usually see 2 blurry dark shapes in the rear seat, with blurry mainly dark heads. Its impossible to tell which is Hickey & which is Bennett. In some frames the 2 shapes & heads are smudged into oblivion. In some frames (especially near Z313) 3 spectators standing on the south side of Elm St block our view of Hickey & Bennett (& our view of the others). The 15 extant frames are jumpy, because they should be 22 frames (7 frames have been skipped by the 3rd rate camera, or are missing). Our pseudo-footage would play much better & tell us more if we had the benefit of thems extra 7 frames. After a long time i realized that one reason that its difficult to see what is what & who is who is that Hickey is looking to his right in some frames, & we see the dark back of his blurry head. This escaped me. I could see the nice pink sides of Agent's faces fairly clearly in lots of frames, but not so for Hickey & Bennett. Bennett shows a little bit of pink much of the time (actually its not even pink, its just a small weak pale smudge of a face-patch). Hickey shows merely a hint of face-patch in a half of the frames, because we see the back of his head mostly. He has turned his head (to his right), & possibly his body (in which case we can see his back). More about Hickey later.
(6) Bennett (sitting in the right of the rear seat). It is fairly certain that Bennett is the one sitting leaning forward (praps he likes to keep his hand on the door-handle), whereas Hickey is in the left seat & is higher & leaning back sitting up on some cases placed on the seat for that purpose. Bennett's head is much lower than Hickey's head. Bennett is looking rightish, possibly scanning for long range threats i reckon (eg the picket fence). If he were looking straight ahead then the sides of his faces should look large & pink like others, but his face-patches look narrow & weak koz we can see the back of his head mostly (but its difficult to tell, being so blurry etc). I dont think that Bennett ever glances directly at Hickey, but its difficult to tell. His face-patch is pinkest at B16, i think that he looks towards the commotion in the limo, or is it a late reaction to the sound of Hickey's shot. Is UYB16 a head turn reaction to Hickey's shot at UYB09? Bennett's head is 100% hidden by the red lady's head in UYB17, & in UYB18 his head is smudged & his face isnt detectable, & later when i included UYB19 i found that UYB19 had a strange pinkish smudge near where Bennett's face should be, but i couldnt find any clear evidence that the possible head turn reaction in UYB16 continued after, if i did find such evidence then it would be ok for me to claim that Bennett had a head-turn reaction to Hickey's shot at UYB09, but no such luck.
(7) Hill (standing on the front of the left running board). Hill can be seen running on the road just ahead of the windshield at UYB04, & by UYB18 he is way ahead almost at JFK's limo. I said "can be seen running" but really its not much better than guesswork, Hill is so blurry. We can see a suspicion of his face-patch in a few of the frames. But there is no possibility of seeing whether Hill had any reaction to a shot at UYB09 (did Hill ever say that he heard the fatal 3rd shot?)(whilst running).
(8 ) McIntyre (standing on the rear of the left running board). McIntyre can be seen looking right in UYB04 to UYB09, ie towards Hickey. We know that McIntyre is looking right because we can't see the pink of McIntyre's face, we see the dark of the back of his head.
And we can assume that he is looking at Hickey because he has seen that Hickey has picked up the AR15.Then in UYB10 we can see the pink of the side of McIntyre's face because McIntyre has now quickly looked towards JFK,
& we can assume that that is because he saw Hickey fire at UYB09.After UYB10 McIntyre continues to look towards JFK.
(9) Ready (standing on the front of the right running board). Ready is the clearest & most vizible of everyone in Queen Mary, ordinarily our view of Ready would be blocked by Hill standing on the left running board but Hill has run off. Ready looks ahead the whole time, & shows no reaction to Hickey's shot.
(10) Landis (standing on the rear of the right running board). Our view of Landis is partly blocked by McIntyre in every frame. In some frames we can see a small part of Landis's face & hair & head. He might have looked to his left towards Hickey when Hickey picked up the AR15, & he might then have looked towards JFK after the shot, but i dont think that we can judge any of that because his face is mostly blocked by McIntyre's head. Bennett is sitting tween Landis & Hickey, & Bennett (leaning forward as always)(as can be seen in photos) has partly blocked Landis's view of Hickey picking up the AR15, hence Landis early on might not even be aware that Hickey has picked up the AR15. Actually silly me i forgot that Landis is standing next to the jump seats not next to the rear seat, hence Landis looking rightish because of the curve is looking awayish from Hickey & hardly likely to notice Hickey with the AR15 & in addition Landis somehow fails to react to the sound of the shot (he should have turned leftish).
Spectators. There are 4 spectators close to Queen Mary on the southern side of Elm St, & others close on the northern side, & others at various locations, but i can't see any obvious reactions by any spectators to a shot by Hickey in Queen Mary. Naturally spectators in UYB04 to UYB18 would be focused on JFK, especially after JFK's reaction to getting shot by Oswald's shot-2 at Z218 (ie 95 Zapruder frames before Z313-UYB09), & especially after Hill has taken off on foot. And Hickey is hidden away in the middle of a ring of Agents.