Ronster said:
Darth Vader says to Luke in the Light Sabre Duel.
"Obi-Wan has taught you well"
Considering he killed Obi-Wan two films ago films ago and in the previous film already had a fight with Luke where he beat the crap out of him and then he comes out with this line.
Bad script writing that.
Unless you believe Vader is in Contact with Obi-Wan but I don't think that at all but it is a slight possibility but I put it down to error than a hint of Vader talking to Obi-Wan or Obi-wan even showing up to speak with Vader just seems off. no no...
The ROTJ Vader v Luke duel isn't really a LS duel, it's more a battle of wills between Luke and The Emperor. Neither Luke nor Vader ever intend to kill the other. The Emperor has two sticks to beat Luke with, his fathers attacks and the danger to Luke's friends. It's all subtext, watch that scene again.
When Vader says "Obi-Wan has taught you well" he is refering to the way Luke controlled his brewing anger and switched off his lightsaber and didn't let the Emperor provoke him. He is not commenting on Luke's relative skills with a blade. Ben spent almost zero time teaching Luke how to handle a sword but he has talked to him about controlling his fear etc.
This is brilliant writing. This is not an error.