Warning! Spoilers ahead for Obi-Wan Kenobi episode 6.
While Darth Vader's broken mask in the Obi-Wan Kenobi finalemirrors his reunion with Ahsoka Tano in Star Wars Rebels, it's not the only connection that can be formed between the two duels.While this newseries sees Darth Vader encountering his old master for the first time since their battle on Mustafar, he eventually reunites with his old apprentice a few years later in the Star Wars continuity. As such, it seems as though Vader's new duel with Obi-Wan greatlyinformed his interactions with Ahsoka on the Sith world of Malachor.
In Obi-Wan Kenobi episode 6, Obi-Wan decided to let go of his past. This allowed him to become rebalanced in the Force and become the Jedi he once was. Having the strength to face his fallen apprentice, Kenobi and Darth Vader faced each other alone. By the end of their duel, Kenobi had damaged Vader's life support armor and broken half of his mask, a very similar outcome seen in the Dark Lord's future duel with Ahsoka Tano in the animated Star Wars Rebels series. As such, it's now canon that the two Jedi closest to Anakin Skywalker both saw the man beneath the mask following his transformation into Darth Vader.
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However, the similarities between Darth Vader's respective Jedi reunions go even further. Not only do both duels feature incredibly emotional exchanges (Obi-Wan apologizing to Anakin and Ahsoka refusing to leave him), but Darth Vader views both his old master and former apprentice the same way. Obi-Wan and Ahsoka both represent the Jedi he once was before his corruption to the dark side of the Force. As such, they're living reminders of the past he's tried to
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