One problem I'm noticing is the immediate cut to the more open shot (showing Luke rolling down the stairs) should show a brief fade/resolution of the sparks created from Vader's saber hit.

Even so, I'm not sure if Vader's saber is actually hitting the floor. Even though he is swinging it down, the saber isn't longer than Vader is tall... so short of Vader starting to crouch or hunch in the final part of his swing, the saber would not hit the floor.

In regards to the SD shot above, I can go either way with running lights.. I think the main thing would be possibly emulating your "lighted hangar" shot and make the hanger bay a bit more lighted up per your mock-up, Angel.