A vehicle is shown approaching the colony from atop the hill. Jack sits down in a lawn chair in front of the trailer. The next shot is an overview of the vehicle overlooking the colony with the trailer in view, yet there is no one sitting in the lawn chair in front of the trailer. A minute later, as bullets start to fly, Jack gets up from the lawn chair.
The previous day's events saw the trailer in at least 3 positions within the fenced lot next to the church. This day's events saw the trailer moved next to the church, outside the lot, ostensibly in a better position for the coming attack, but then back into the fenced lot later in the day. By nightfall, it was again outside the lot next to the church. The truck, as well, varies back and forth to being attached to the trailer and parked across the road.
A couple of -days-weeks-etc- ago, Jim could have alerted his earlier handlers to this current mess and they could have provided support.