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Jedi like Obi-Wan and Anakin survived Force Lightning. Grievous can still physically harm him, if the heat of a lightsaber doesn't do much then the force of getting hit by it from a character that can punch and kick others at his level will do. Grievous can reflect the beams, not sure if back at Ultron but at least away. And Obi-Wan specifically had to open first his chest to do that.
Jedi like Obi-Wan and Anakin survived Force Lightning. Grievous can still physically harm him, if the heat of a lightsaber doesn't do much then the force of getting hit by it from a character that can punch and kick others at his level will do. Grievous can reflect the beams, not sure if back at Ultron but at least away. And Obi-Wan specifically had to open first his chest to do that.