I noticed that the animal fury rage power requires nothing more than a free action (the rage power default) to use. I also don't see any limit on the number of rage powers that can be activated in one round. Given that this allows a barbarian to make any unspecified number of bite attacks per round at 3 rage points each, I can see some problems developing here. (A 10th level barbarian with 18 Con will have 72 rage points to burn; that's potentially 20+ attacks in one round.)
Well.. when writing this, I thought it was obvious that the limit was one, but I guess not.
Well, that particular power somewhat implied it. But more generally, there doesn't seem to be anything preventing a barbarian from burning dozens upon dozens of rage points per round.
