Ronster, you seem to be over-thinking this scene, but in your fixing , you are creating more problems. If you have leia coming from that direction in the end then she would be in front of Chewie the whole time. Plus the screams need only be there when they are running past the people. there is a passage to time between that shot and them reaching the platform door and chewie and R2 are behind Lando and leia. Chewie covers the way the came and Leia covers the other direction. You seem so concerned about chewie shooting stormtroopers in the wrong area, but to fix it you are flipping shots to create continuity problems. But did you notice that the first close-up shot of the stormtroopers by the stairs being shot (by Leia) is actually set AFTER the stormtrooper that is shot by chewie as the rear trooper can be seen stepping over the dead body of the dead one?

But the other fixes you spoke of (lights turned out and no smoke or sparks on shot trooper) have already been fixed a while ago. Unfortunately the video i posted on youtube has been blocked so has now been deleted.