hmmm... I still prefer my original interpretation of the scene, which deals with the original (superior!) version of the scene. Vader has half the freaking fleet searching for Skywalker. He hasn't been hiding that from the emperor.... The Emperor calls him up to say, "hey, that Skywalker kid you're hunting? He's our new greatest enemy. Kill him." That's when we see the first streak of the "good still left in [Vader]." Vader has compassion on the son he never knew (or perhaps second thoughts about being so evil?), and , on the spur of the moment, essentially says, "uh...kill him?....hmm.......HEY! we could turn him to the dark side! That'd be better than killing him, right?" So, he's able to evade the Emperor's order by swaying him, using his own greed for a new, potentially more powerful apprentice. It's only then that Vader comes up with the idea of getting Luke to join him and take over the galaxy from his master. It was NOT his plan all along. In my mind, before the PT, Vader turned because he was seduced by the dark side. He believed in the Emperor and trusted him blindly once he turned. It was when the emperor ordered him to kill his own son that Vader doubted his master & that flicker of good left deep, deep down inside him sparked for a short moment. And once it sparked, it slowly smoldered, without Vader even realizing it most of the time, until by the time Luke turns himself in at Endor, it has become a tiny flame. & of course, watching his son die at the hands of the emperor ignites that flame into a raging fire where Anakin finally defeats Vader once & for all, destroying his evil master in the process. To me THAT is the story arc of Darth Vader, not what we were presented with in the PT. The whiny "Mannakin" who's always planned on turning against his master from the get go just doesn't compare to the dramatic impact of the story of someone who totally falls for & believes in something that is basically evil incarnate, only to realize once it's too late that they've been mistaken, & then over come that power in one final act of ultimate bravery & self sacrfice.