2:26 onward. It looks like Rey has a crackling Saber watching it on my phone. Haven’t checked on my monitor yet. Wish these shots happened.
Hard to tell if it’s actually crackling or if it’s just art interpretation of the glow. I think it’s the latter, since this looks close to the TROS final product and there isn’t any other known crackling art.
And concept art always looks more interesting than the final product, because drawing lets you get crazier than what camera/sets/props/actors/budget can. That pic is basically what happens in the movie, just not as cartoonish.