Broom Kid, no worries, I wasn’t offended by your comment. I do disagree with it though (respectfully, I hope!).
Not only would I freaking mutiny if I saw Rey using lightning spoiled in a trailer, but I also think it represents more than just a flashy visual. Like I explained, I believe that Rey is losing control in that moment and tapping into the Dark Side. Lightning seems (to me) to be a perfect way of visually representing that. And it will work especially well in the larger film as a whole, connecting back to her first moment of using the Dark Side. Plus, one of the things we’re trying to do in V2, with the new dagger stuff and the eventual Rey Nobody version, is to add a throughline of Rey tapping into the Dark Side, rather than spending the whole movie repulsed by it. (That way the finale actually has some stakes.) The Death Star Duel is the end of Act II - structurally, the moment in a film where our hero should be at her lowest.
Since the idea has some support behind it, I think, at this point, it will depend on the quality of whatever visual effects can be produced for the shot. So I guess we’ll have to see what happens!
EDIT: And Cinefy, I love the look of the lava cracks. If it can be tracked in and animated convincingly, I’d love to see it included.