The blue lightning has an overall heavy blue cast even without the blue lightning so I think it fits okay as a vision or even misleading implication that it’s the huge blast we see put right after it.
Yeah, I think Dom’s idea with the vision was that it looks like it’s Evil Rey casting down the lightning blast, but as you watch the film you realize the vision was showing separate events. Which is why I said it’d be more jarring to see two versions of the same footage, but you’re right that the blue tint on the shot already hides it’s true colors so it still works in that way, and it’s meant to be a cryptic and wavering glimpse of the future, so it’s fine.
And for the opening vision I had just snipped out the first bit about her parents so that it is just her “vision about the throne of the Sith and who was on it.”
Oh, well that works as a quick and easy approach. Still, It would make sense to add a bit more to her vision to keep it similar to Kylo’s, which shows glimpses of other places, the future, the past, and in a way that helps consolidate his character and set up his motivations. Now that we don’t need to rethread on Rey’s parents, it’d be an opportunity to better set up Rey’s stuggle and connect it more with TLJ.