As 005 stated, the rails are split into sections. you can see this clearly in other shots of the gantry. Your interpretation of where the saber slashes is incorrect. You seem to have based it on the whole blade of the saber slicing the wall when in fact only the tip would have made contact with it with the angle of Vader's swing, so my placement is correct. I went through it frame by frame to get the placement correct. Plus, since that clip was originally rendered months ago, i had finished the rotoscoping of the sabers as these weren't 100% completed at the time. The blade was made slightly longer because it doesn't even come in contact with the wall, so this was fixed plus you can see when the saber slices through the rail its on the wrng side of the rail instead of slicing through it. But even with the blade its original length it doesn't cut anywhere near the door entrance edge