Here he does seem to be putting something behind him... a walkie talkie?
A camera.
from Willis 5
from Bronson frames in Jack White collection
from Z-film -- camera straps around DCM's neck? below
If a camera ... other than Zapruder ... would make DCM the only person
on the north side to have had a camera pointed at JFK? if so he'd have a unique and most revealing POV.
Just for the conspiracy theorist in me -- the Stinger, .22 camera gun -- allegedly a CIA weapon. A useless inaccurate weapon unless inside an aimable object, such as a camera! The firing system Col.Prouty claimed was CIA operational, invented by Charles Senseney at Fort Detrick, capable of firing either .22 or self propelled flechette's.
from
https://www.albany.edu/faculty/dgoodwin/CIA_Museum/22.html
