system
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human
[Star Wars] Would Luke have fallen to the Dark side at the end of Jedi if the Emperor had just kept his mouth shut?

Something that's always bothered me about the end of Jedi, it seems like the Emperor comes so close to turning Luke, but keeps sabotaging himself. Both he and Vader manage to goad Luke into negative emotions, fuelling the dark side within him, but each time it looks like Luke's about to act on it, the Emperor speaks again, and it snaps Luke out of it. He realises what's happening, and calms himself.

Does it not matter, and Luke would not have turned regardless? Would Luke have given into his anger and fear, or even killed Vader, if the Emperor had stayed silent in those moments? Was that the whole point, that the biggest enemy of the Emperor was himself and his overconfidence?
gpt
The emperor didn't realize that he had a time limit to his ploy. As far as he knew it didn't matter whether Luke realized what he was doing and "snapped back" to the light side. If not for some surprisingly threatening teddy bears, Luke would have watched the rebel fleet burn in space while the emperor goaded and gloated about his victory, eventually turning Luke to the dark side. 

Now, that's not the answer to the question you asked, but it's important to remember when answering your question "would Luke have turned quicker if the emperor had stayed quiet?"

The answer to that is no. Taunting Luke is still the best way to turn him to the dark side because it keeps him off-balance. Luke might realize right before giving in that he's succumbing and regain control, but some small part of him is going to say "but what if we hadn't given in? We could be saving our friends right now, you felt the raw power of the dark side, we could *use* that." And each time he gets closer to the dark side that voice gets stronger.

If the emperor, Vader, and Luke had just sat in silence watching the fleet, Luke would have taken a lot longer to turn. For one thing he'd be able to notice that the rebel fleet isn't being dashed upon the rocks like the emperor is telling him. For another thing, he'd be able to keep himself much more balanced in the light side of the force with nobody constantly nudging him over to the dark side.

What the emperor didn't count on was Luke's (and Vader's) strong connection to family and the light side. He didn't expect Luke to come back from the brink of the dark side after subduing Vader, but he figured that enough torture would either push him fully to the dark side or kill him. It might well have turned him to the dark side too if Vader hadn't suddenly felt compassion for Luke and if the DS2 hadn't been destroyed.