Actually, I was thinking the same thing. I think it also has something to do with the colorization of the explosions, along with the fact that they look a little two-dimensional. It just doesn't seem to fit in along with the way shots have been fired up until that point in the film.
Overall, though, the clip looked great. I can't wait for this edit . . .
Take care, Sojourn
P.S. I was rewatching your first preview clip, and wanted to point out how much I love Luke's re-done lightsaber. It really does look quite good.