Darth Vader: The Emperor's fleet has arrived.
Galen Marek/Starkiller: You have lured the Emperor to us! When do we strike?
Darth Vader: I did not summon him. (they turn to face the Emperor as he enters the room, and Vader runs Starkiller through) His spies followed you here.
Darth Vader: What is thy bidding, my Master?
Emperor Palpatine: You have forgotten your place, Lord Vader. By taking this boy as your apprentice, you have betrayed me.