I think the light bee was meant to be there in Entangled. They just didn't bother with the effect of showing it hovering there. Maybe they figured it world just confuse the issue showing the light bee remain behind at the doors while Rimmer stepped through in his soft-light mode. Possibly it wasn't required as they were on a ship which may have had its own holo-emitters which could be utilised, which would explain how he could be projected beyond the wall. The projectors the other side of the wall simply take over when he 'steps through' * But I'd suspect they'd use the light bee as the main source of projection on away missions, even if they borrow other emitters when they really need to. Best to rely on what you own rather than other tech elsewhere, and it gives Rimmer his independence. *An illusion, as he wouldn't actually step through. Light doesn't pass through a solid object unless that object is transparent (I.e. a window) , after all. The emitters each side of the door simply project the part of Rimmer each side as he appears to pass through. Of course future tech might have gotten around that. Maybe holograms actually can be projected through objects... The fact holograms exist in that world at all shows they have a mastery over light manipulation beyond us, and that's just soft-light!