It's saying that the magic that has bound us has a containment radius that if we're to wander outside of, we'll teleport back to where the majority of the group is currently clustered.

That wander radius is fluctuating, as is the centralized point we'll be teleported to each time -- and I've yet to determine the exact algorithm that determines how far we can wander or where "the group" is considered to be located -- but I believe the basic principle is to keep us clustered together.

Which suggests our captor or captors want us to stay together for some intended purpose.