The org's fear theme has really been emphasized recently- the bunker video and now the convention video with JWs being pursued by guys with assault rifles.
This image comes from the Watchtower July 2017 Questions From Readers: Would it be fitting for a Christian to keep a firearm, such as a handgun or a rifle, for protection against other humans?
The caption for the image is this: During the great tribulation, Christians will rely on Jehovah and not try to defend themselves
I did an image search for this illustration and found a cropped version of it on this site here:
Somebody in Nigeria must have read that Watchtower and figured that it fit well in their prediction of how the Great Tribulation will go down (it is likely a little difficult to find stock images of people being threatened with assault rifles)