Another way to do this is to game the walk timer -
After you pull mobs out and then fd, each of them has a random walk timer. Once it expires, each individual mob walks back towards its spawn. The timer is only reset once the mob reaches the spawn, so what you can do is pull the pack out, fd, wait until the first mob resets, then stand back up. They'll all social and come running back to you. FD again, and only the one that reset will have a walk timer, the rest go walking back immediately - voila, they're split!
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