TMBTM said:
Yeah, but Vader's just sick of being the Emperor's puppet - he's power-hungry at this point and wants to rule on his own, not be the underling of someone he knows will never relinquish power. He knows, however, that he's not powerful enough on his own to stop the Emperor - but with Luke at his side, they may win. It has nothing to do with the "rule of two.
Yeah that's true, you can see it that way or (now that we know the PT "rule of two" ) that Vader is also trying to "save his skin" by turning Luke into his own apprentice before the Emperor does. I know that is probably not what Lucas had in mind when he shoot that scene in ESB, but now that we have to deal with the prequels I just try to find ways to live with them ;)
I disagree with this completely. Only when Episode III came along did Lucas start diminishing Vader's power. He went on to push this in that awful Rolling Stone interview.
If you remember ESB, it is Vader who comes up with the idea of turning Luke, not Palpatine. Palpatine simply wants Luke dead.
So I don't think Vader was trying to save his own skin.
Also, I believe that Vader was a true Sith and accepted that his Master would die one day and he would have all that he had. His obligation would be to train an apprentice to keep the line going.
It is only when Luke is discovered that Vader sees that it may be his destiny to take over the galaxy as Emperor and have his son as his apprentice.
Luke's very existence makes Vader question some of his past decisions. Since he doesn't know about Leia, Vader believes Luke is all he has left of Padme, of the Jedi... of that life long gone.
By ROTJ, after Luke refuses his offer, Vader slinks back to Palpatine, to the only life he knows and sits there regretful, filled with self-loathing, and afraid that the Emperor will murder his son because he knows his son will not play ball.