Question: How did Luke know that removing the mask would make Vader die?
Matty Blast
13th Jun 2005
Star Wars: Episode VI - Return of the Jedi (1983)
Answer: It's almost certainly known - through Rebel intelligence gathering if nothing else - that Vader's suit functions as a life support system and the various details that go along with that.
11th Jan 2005
Star Wars: Episode VI - Return of the Jedi (1983)
Question: Why couldn't the Emperor sense the presence of Luke Skywalker on Endor (per his conversation with Vader)?
Chosen answer: The Emperor did sense Luke. He just didn't tell Vader that, because he was planning on replacing Vader with Luke (kind of like replacing an old sedan with a new sportscar) and double crossing Vader.
Same thing what happened in Episode III, Palpatine deceived and betrayed Dooku by not knowing he was just a pawn to his plans.
Answer: You never know whether The Emperor is telling the truth or not, but either way what he's trying to convey to Vader here is that he's starting to get the tiniest bit of doubt over whether Vader has truly purged all compassion towards his son, and if not he'd better nip that in the bud, pronto.
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Chosen answer: Obi-Wan told luke how his father was more machine than man now, and Luke knew Vader had a life support system, so he concluded that he would die without his mask, especialy given the weak state he was in.
Piemanmoo