When Luke levitated his lightsaber into his hand and swings, is he aiming to strike down Palpatine? If so, why did Vader block it? Vader wanted in ESB, “join me and together we can rule the galaxy as father and son,” and his words to Padme, “I am more powercul than The Chancellor, I can overthrow him…”
Is Vader trying to prevent Luke from:
a) striking Palpatine down and his journey to dark side being completed
or
b) knows Palpatine can do essence transfer and will possess Luke’s body as The Emperor claims in TROS?