Call me a crackpot, but this whole scene looks pasted together.
Take some generic Vader footage and audio outtakes, add in a darkly shrouded figure constructing a lightsaber, CG in a Luke face in the very dark hood, and throw 3po in the background (the only real footage shot for this scene).
Instant Deleted Scene!
(Yes, after years of being lied to by Lucas, I am this jaded.)