Star Wars: The Clone Wars, Season 4

Captain Rex:
[takes one blaster out of its holster] Turn around. Step toward the wall. [Krell rolls his eyes and turns around] On your knees. [Jesse deactivates the cell ray shield]

Pong Krell:
[chuckles] You're in a position of power now. How does it feel?

Captain Rex:
[points his blaster at Krell] I said, "On your knees."

Pong Krell:
[kneels to the floor] It feels good, doesn't it? But I can sense your fear. [Rex's hand is shaking] You're shaking, aren't you? What are you waiting for? The Umbarans are getting closer.

Captain Rex:
I have to do this!

Pong Krell:
You can't do it, can you? Eventually, you'll have to do the right thing and-- [A laser hits Krell in the back, killing him. It is revealed Rex didn't kill him, but Dogma did using Fives' gun]

Dogma:
[voice breaking] I...I had to. He betrayed us.