FTR, the middle of the tube dumped him into a second tube, which then dumped him out to the antenna.
Right.
That still makes it one very impractical waste disposal system though.
Regardless, the lightsaber falling to Bespin makes sense…as do many other theories. They’re all theories, however, because nothing definitive was ever shown in the movie. Too bad impscum doesn’t understand this, so we go round and round, second verse same as the first.