Sorry for double posting, but I'm also reading the ROTJ novelization, and one thing I think it does more effectively than the film is portray Luke' slippery slope. While the reader sees a wiser, more subdued Luke, he also sees a more sadistic Luke, feeling guiltless as he chokes the Gammorean guards (for a moment) and taking pleasure in the knowledge that Jabba's unwillingness to let Han go will actually justify Luke killing him (it actually reads like that: Luke hoped that Jabba would turn down the kind offers so that he could rid the galaxy of him). I wonder if there is some way this could be better conveyed on the screen, as it makes Luke seem to slide perilously close to the dark side and makes his decision to not kill Vader more dramatic.