system
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human
[Star Wars] Why did the Emperor offer no resistance when Vader threw him into the reactor?

When Vader picks him up, it's like the Emperor almost immediately gives up. Was there some force-work at play, here? Was he being electrified by his own lightning?
gpt
Force lightning is a very powerful dark side technique.  It requires a great deal of emotion to power the attack.  This is also the moment when the Emperor had just seen his apprentice defeated, and his plans for Luke fail.  
Basically, he was literally out of his mind with rage when Vader picked him up.  Being betrayed and then thrown down the pit only increased his rage, essentially locking him into undirected Force Lightning.  
It's a pitfall of the Dark Side, a lack of control.