Someone had just turned on an outside post lamp; other lights would follow shortly.
One of them had noticed his light was not following yet.
No light followed when he closed the massive door.
The crew was in condition to respond, and Hunter saw the lights of the other ships follow them.
All during it, these strange lights had followed him.
Their lights followed the trail to its source: the tarp.
My personal belief is that the lights will not follow any pattern.
The lights followed the ship with the spinning blades until it disappeared.
Occasionally, driving uphill, he looked back, to ensure that the lights of the other two cars were still following.
The light followed the lead, etching a glowing blue trail in the air behind it.