User blog comment:The Milkman/The Writing of the Ending/@comment-4947746-20120529225314/@comment-1341687-20120530165241

The light is a visual representation of a signal. That signal destroys the relays as well as telling them where to send the signal next. For all we "know" (as there are so many holes) they could be pushed by a more precise system similar to needing the IFF for the Omega-4 relay.