I see that scene can work because when we cut from vader to wide executor shot that means that time passed. That blink in our eyes could be several minutes in movie. Executor was in the asteroid field. So i assume it took time to be out of it. So yes Vader can be more remotely and show that with this trick. The good news are that the doors are closing quickly so no hard work to the reflections down there. Making the hall dark and cold. Talk to vader is not an easy job.

Thats my POV.

-Angel