"Force Flash" fighting is a new Force ability that Kylo Ren and Rey are speculated to have in Star Wars: The Rise of Skywalker, enabling them to engage in duels from opposite sides of the galaxy, locked in combat as the environments around them shift. These could be the result of powerful Force visions, or even teleportation.
The rumored power was reported by the fan site MakingStarWars, but there are additional clues in the Star Wars universe that may confirm Force Flash fights as a crucial plot point in The Rise of Skywalker.
The main and most suggestive one is the cover of the upcoming book The Art of the Rise of Skywalker, which depicts Rey and Kylo Ren clashing lightsabers while standing, as mirror images, against different backgrounds. That could be a visual metaphor for them being on opposite sides of the Force, or a more literal representation of them fighting from different locations.
The second clue appears Battlefront 2. Kylo glitches around Luke Skywalker during a lightsaber duel, almost teleporting around the battlefield. While it's almost certainly an unintentional glitch, it may predict the kind of Flash Force fights we could see Kylo be a part of in the near future.
Then there's the matter of Force Flash fights serving as a natural progression of the Force bond that Kylo and Rey developed in The Last Jedi. It progressed from simply seeing each other across the galaxy to being able to experience the other's environment to touching palms.
The alleged second characteristic of these Force Flash fights would also be amping up the Force visions that Rey experienced when she touched Anakin's lightsaber in The Force Awakens, and the ones that Kylo felt when he touched Darth Vader's helmet, which, "showed him the power of the Dark Side."
There are a couple of counterarguments to the theory, however. The first is that, as the Force bond was artificially created and stoked by Snoke, as soon as the Supreme Leader died, the connection should have been severed. The second is that teleporting or projecting one's essence across the galaxy is so exhausting that it can kill the Jedi or Sith doing it, as we saw with Luke's last stand in The Last Jedi.
However, these two objections can be easily dismissed. Following Snoke's death, Rey and Kylo shared a final Force bond scene when the First Order penetrated Crait's Resistance base. It was Rey who closed the door, hours after Snoke died, which proves the bond was still functioning.
Regarding the exhaustion that weakens Force users when they project, there are two possible solutions. One is the Force, or some other entity (Palpatine, perhaps), is helping facilitate the last two powerful Force users to connect in this way and clash over and over, and it is this external influence that causes the Force Flash fights. Or maybe, in the one year between the events of The Last Jedi and The Rise of Skywalker, Kylo and Rey have expanded their powers so that are no longer restricted by that limitation.
Moving on to contextual clues deduced from interviews with the cast and crew, Daisy Ridley has been both hyping her fight sequences with Adam Driver, saying she can't imagine what they'll look like once production is complete. She also mentioned The Rise of Skywalker won't be precisely the Star Wars we're used to. Although some fans took that to mean an increased romantic undercurrent, a la The Last Jedi, it could also mean something completely different.
Speaking to Vanity Fair, director and co-writer J.J. Abrams said:
“The challenge wasn't just to make one film as a standalone experience, but one that, if you were to watch all nine of the films, you’d feel like, 'Well, of course, that!'
“Working on nine, I found myself approaching it slightly differently. Which is to say that, on seven, I felt beholden to Star Wars in a way that was interesting – I was doing what to the best of my ability I felt Star Wars should be.
"[...] This trilogy is about this young generation, this new generation, having to deal with all the debt that has come before. And it's the sins of the father, and it’s the wisdom and the accomplishments of those who did great things, but it's also those who committed atrocities, and the idea that this group is up against this unspeakable evil and are they prepared? Are they ready? What have they learned from before?"
Force Flash fights, if they occur as described, would be the perfect way to allow Kylo, Rey and the viewers to revisit the previous eight installments of the Skywalker Saga with new eyes. Luke already hinted at the Jedi being much less benign than they seemed in The Last Jedi, and even after the release of the prequel trilogy, the dissonance between what a Jedi was supposed to be (noble, good, pure, serene) and what they actually might have been (liars, cheaters, manipulators, kidnappers of children, stagnated) was astonishing.
Force Flash fights would also allow Rey and Kylo to revisit the forces of destiny that shaped them to be what they are, and maybe to take a third, creative path to defeat that unspeakable ultimate evil that Abrams talks about -- who is Palpatine, because, of course, it's always Palpatine.
Directed and co-written by J.J. Abrams, Star Wars: The Rise of Skywalker stars Daisy Ridley, Adam Driver, John Boyega, Oscar Isaac, Lupita Nyong’o, Domhnall Gleeson, Kelly Marie Tran, Joonas Suotamo, Billie Lourd, Keri Russell, Anthony Daniels, Mark Hamill, Billy Dee Williams and Carrie Fisher, with Naomi Ackie and Richard E. Grant. The film arrives Dec. 20.