Originally posted by coolmoviesthe reason why vader needs the mask is pretty much the same reason why people with lung disease or that cant breath right need oxygen tanks, so when luke took it off he couldnt breath.....i knew that even the first time i watched ESB like when i was 5
luke said if i take it off u will die thats why he uses the chamber plus fans thought vader was a robot thats why he takes it on and of in ESB
an to answer your earlier question vader was in extreme pain and shock and was basically having surgery done on him while he was awake, let alone that he just got a new arm and two legs soething that takes longer than a minute to get used to, so the medic droids did it for him. and it RotJ he only has one arm and is in fact dying, he cant walk and can hardly breath with the mask on which means he was to weak to take it off so luke did