Board Thread:Speculation House/@comment-4830106-20130823152544/@comment-15108745-20130824011011

The Grim in the Emerald Forest definitely aren't being controlled by anything or they would have probably made some concentrated effort to take the students out one by one. They seem to just be running free. There's been a theory thrown around that they Grim are controlled by some kind of hive mind like the flood. So I imagine that if that theory is true, then these Grim could have just been cut off from the main brain.