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Originally posted by: rennervision
Whatever the explanation is, it better not have something to do with Anakin discovering how to do it for the first time. In Episode IV, Obi-Wan says to Vader, "If you strike me down, I shall become more powerful than you can possibly imagine." I doubt he was preaching to the choir. And it clearly seems Vader is surprised once Obi-Wan vanishes. (Otherwise, why is he stepping on Obi-Wan's cloak trying to figure out what happened???)
Yes, but in the original script, or as it was originally filmed, the exchange goes.
'Your powers are weak, old man'
'You can't win Darth. If my blade should find it's mark, you shall cease to exist. If you strike me down, I shall become more powerful than you could possible imagine'
Which makes alot more sense, because I never understood Obi-Wan saying 'You can't win', because he only presents one side of Vader's lose-lose situation.
Remember, even though in EPI Qui Gonn is Obi-Wan's master, Yoda is the one that finishes his training. Qui Gonn was a student of the Universal Force (I believe some have referred to it as) while Yoda is a student of the Living Force. Thus, I always believed Yoda and Obi-Wan merely became one with the Force that surrounds them.