Perhaps...
the rifle position is suggesting which random key encryption table they will be using for the message to follow? Assuming 8 easily discernable positions (12 O'clock, 1:30, 3:00, 4:30, etc...) they could have 8 variations on which pre-defined encryption scheme to use... That's just one possibillity... I heard that pixel counts on images can be used for coordinates. A lot of information COULD be transmitted with one graphic file in a web page, depending on how much one wanted to convey. It's very disturbing from an intelligence gathering standpoint that so much can be hidden in plain sight.
Just a few thoughts,
Screamer
"As people assemble, civilization Is trying to find a new way to die,
But killing is really, merely scene changer,all men are bored, with other men's lives"
...
"We all know success, when we all find our own dreams
And our love is enough to knock down any walls
And the future's been seen, as men try to realize
The simple secret of the note in us all
in us all"
P. Townshend - Pure and Easy