One of the strongest theories is that Abhishek Bachchan's character 'Beera' has a split personality. There is a good side and a bad side a la Dr. Jekyll & Mr. Hyde, and depending upon which side dominates, 'Beera' behaves in a good or evil manner.
In fact we are reminded of Abhishek's dad Amitabh Bachchan's AKS act which was also quite similar, though ahead of its time and could have scored if the film released today. And it translates into assuming that the split personality 'Beera' may now click with the audience, if it is indeed the case.
Well, for now we can just speculate about the floating theories and have to wait for less than 24 hours (for RAAVAN to release) to get a confirmation or contradiction of the above!