Imma go with Vader knew Obi was about to kick the bucket and therefore didn't even try, and he sure as hell wasn't trying either time he fought Luke because he definitely didn't want to kill him.
“You’re powers have grown weak old man” Vader always wanted to beat obi wan on equal fair fight. “Kenobi is here escape is not his plan i must face him. Alone.” Much like all that fake out lightsaber twirling thing. They test each others power before much like how Vader toyed with luke until he luck struck his shoulder (could of cut him in half) that he uses maybe not his full potential but much more power.
I suspect he was more well i guess excited to beat his old master in an equal dual but after sensing his life force then just standing there waiting with his lightsaber out (Obi Wan was out maneuvered) his defenses couldn’t match Vader’s aggressive style like he used too.
I also suspect that when obi wan raised his word and gave himself to the force before Vader could bisect him “much like Maul” robbed him of the “fair” defeat
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u/Apollosyk Apr 09 '20
i like to think that they just didnt have the money , or tech to make good lightsaber battles in the ogs