Jim concentrated on turning into something, but nothing seemed to happen. His body wasn't changing at all. But then he looked across the room and saw Rick's desk chair begin to lose its structure, melting into a formless, but morphing object.
He seemed to have it all wrong. The spell didn't allow a person to change themselves. Instead, it allowed a person to change other things, or other people. In this case, Rick's desk chair. He figured that the chair was morphing because Jim was looking at it when he was concentrating.
Jim and Rick watched and waited as the chair changed into its new form, which was ...