I was thinkin somethin like this. He remembers a bit more about Rosa, making it more important. He screams bloody murder and chases whoever stole it down, if it was Dan or one of the humans, he'd blame it on all of them, claiming conspiracy against him, that they were all trying to get him, steal the last thing he loves and kill or kidnap him, or that they were working for the madman. Then he'd run off somewhere and hide himself and talk to the pendant for hours, and in turn, remembers more about Rosa.