The starbase is firing full lasers at the Radiance to the left. However it is firing no shots at all at the Disciples to the right.
This seems contrary to my understanding of how it's supposed to work.
Note: The picture is modified, but only because I lost the first picture I took and I loaded the game back up with a mod enabled. The gamesave is unmodified.
http://www.deadlyshoe.com/SINS/adventsb3.rar - Savefile. Goto controlgroup 2.