system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why does Obi-Wan's lightsaber absorb Dooku's force lightning, but Windu's lightsaber reflects Sidious' lightning?

Follow up question: After Windu reflects the lightning and it connects with Sidious, why doesn't Sidious just stop shooting the lightning?
gpt
Windu was a master of Vaapad, a form of lightsaber combat that he invented. Vaapad was more than just a fighting style; it was a state of mind. Windu would channel his own negative emotions and, crucially, those of his opponent, allowing him to "walk the line" and remain in the light. This is what let him fight Sidious; he was throwing the Sith Lord's own power back at him. When Sidious evoked Force lightning, Windu used Vaapad to reflect the Dark Side, and by extension the lightning, back at him.