Ziva: Are you jealous?
Tony: (he pauses) No. I'm worried. Because you don't seem to understand that your secret friend is interfering with this agency's ability to shut down a terrorist cell!
Ziva: Interfering? How is he interfering?
Tony: He's already killed two suspects.
Ziva: Well, in my country that would be cause for celebration.
Tony: You're not in your country and neither is he!