A little off topic, and I'm sure this question's been brought up before, but I was just watching the duel again between Obi Wan and Darth Vader in 'A New Hope', and the question struck me. Considering how much both were backflipping, somersaulting and swinging those lightsabers like there was no tomorrow in 'Revenge of the Sith', do you think Darth Vader was fighting Obi Wan seriously, or was he simply toying with the old man?
True, Obi Wan by the time of 'New Hope' had become incredibly old and weak to fight like the way he did twenty years back, but for Darth Vader (especially considering how well he was swinging his lightsaber in 'Rogue One'), I honestly felt he could have struck his mentor down in a cinch with one blow (which he kind of did eventually). Was he deliberately dragging the battle?
Aside from the fact that we don't really see the Force being used to push/move things/people until The Empire Strikes back, the additional material has done a good job of establishing those differences as having some reasons to them.
The episode
Twin Suns of Star Wars Rebels actually built up some framework for Obi-Wan's change. It shows a difference in both Obi-Wan's overall attitude towards conflict –
even with old enemies, as well as the changes to his combat style in being more focused on countering specific attacks and less-so on movement.
Additionally, Vader is an old-man-with-extensive-damage-to-his-body-who's-mostly-grafted-on-robot-parts-now, so the more acrobatic feats are a bit less within the realm of expectation for him, and as
Rogue One shows, he's more of just an unstoppable wall of darkness with a lightsaber once he's all suited up, rather than the more acrobatic Jedi he was in his youth.
When you put those two things together, the duel that they have is much more expected.
Insofar as the combat in
The Last Jedi, here's what has been established and I'd expect to see.
• Kylo Ren is just INSANELY powerful with his Force abilities: Freezing both people and blaster bolts in mid-air are things we didn't even see with the Prequel-Era Jedi. He's very showy with his lightsaber, so I'd expect plenty of fanciful stuff from him, HOWEVER his emphasis is also VERY focused on just raw power drawn from rage.
• Rey's being taught by Luke, who's also trained a now-destroyed Jedi academy, so I'd expect there to be a level of discipline in her combat that he never had (being a Yoda dropout himself), in addition to her already being very capable with the staff she had back on Jakku.
We're likely not going to retain the Forms from the Jedi Era that have more fanciful swinging sabers around in an almost dancing form-like combat. Again – while lightsaber combat was trained, the Jedi were primarily meant to be be peacekeepers and much like tournament-like martial arts there is an expectation of form and function on both sides that no longer exists after the fall of the Jedi & Sith.
Again, I'm going to point to Rebels (specifically Season 2) as a great point of reference here, because if you look at the difference in the fighting styles and capabilities of Kanan (was partially trained at the Academy) & Ezra (trained all second-hand) as compared to Ahsoka (fully trained at the academy and fought for years with the Jedi), there's a distinct difference, but they strike a good balance between the prequels and the original films that I'd expect them to continue in the new movies.
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