I'm by no means an expert on this mod, but my understanding is the "strobing" occurs to make sure your team is continuing to follow the "master" as you move through the world. I'm sure there's a constant check through the use of scripts to make sure the slave is still in an "auto-follow" status. If for some reason you go into an area with phasing areas, tree's, or whatever which breaks auto-follow, it will alert you who is not following anymore via the different options in the mod. Those options being raid/party warning, chat, and/or the "status" window. That is my understanding at least and hope this explains it.