[from the Blu-ray version, as Vader watches Luke being destroyed by the Emperor's Force lightning]
Darth Vader: No.
[Vader turns to the Emperor]
Darth Vader: NOOOOOOOOOO!
[Vader lifts the Emperor over his head, leading the Emperor to scream in shock as his force lightning shoots upward onto Vader, who throws the screaming Emperor into the abyss of the throne room and the Emperor hits the core of the shaft, causing an explosion, then Luke pulls his weakened father to safety]