Only Together Can We Defeat The Emperor (Star Wars)

Darth Vader: My spies have located another Jedi. Kazdan Paratus is far more powerful than you. I do not expect you to survive. But if you destroy him, you will be one step closer to your destiny. 
Starkiller: The Emperor. 
Darth Vader: Yes. Only together can we defeat him. 
Starkiller: I will not fail you, my master.