Unsympathetic Renee Walker thinks that she did Ziya a favor by cutting off his thumb.

Renee Walker: He’s still bleeding out.
Jack Bauer: This should cauterize the wound.
Renee Walker: Okay, it’s working. Who are you calling?
Jack Bauer: Hastings.
Renee Walker: Why?
Jack Bauer: Cause I’m shutting this operation down. You shouldn’t be in the field, and this proves it.
Renee Walker: This was the only play, Jack. You would’ve done the same thing.
Jack Bauer: The play was to get him to cooperate!
Renee Walker: He will cooperate.
Jack Bauer: How do you figure?!
Renee Walker: Look, I know these guys, Jack. The only thing that Ziya likes more than 13-year-old girls is money. He’d have butchered himself for a score like this.
Jack Bauer: Yeah, well, Hastings still needs to know the truth.
Renee Walker: The truth?
Jack Bauer: That you’re unstable! Look… I don’t blame you after everything you’ve been through, but you are not fit for this mission.
Renee Walker: I went through a rough patch, yeah, but I came out on the other side.
Jack Bauer: And I don’t think you have.
Renee Walker: The bottom line is, I’m still the best chance that anyone has of intercepting that uranium, and I can do it now. So, what’s it gonna be, you making that phone call or what? (Ziya groans) He’s waking up, Jack. Make up your mind.
Jack Bauer: Fine. You see what you can get out of him. But don’t forget, I’m listening.
Ziya Dakhilov: (screaming) Renee!
Renee Walker: Shut up, Ziya.
Ziya Dakhilov: (screaming) Renee!
Renee Walker: You’ll get your painkillers as soon as we get out of here.
Ziya Dakhilov: What did you do?!
Renee Walker: I got the bracelet off, alright, I did you a favor.
Ziya Dakhilov: Renee, you crazy bitch! You cut off thumb!
Renee Walker: Look, what’s done is done. You can either stay here and whine about it like a baby, or you can come with me and be a rich man. Look, I’m willing to give you a point on this deal off the top. It’s a lot of money, Ziya.
Ziya Dakhilov: How much?
Renee Walker: Two-and-a-half million. Maybe three when it’s all done.
Ziya Dakhilov: Two million? You’re serious?
Renee Walker: You tell me.
Ziya Dakhilov: I take this deal to Vladimir, and it’s not real, you know what happens?!
Renee Walker: Why would I be here if this wasn’t real?! Fine, forget it, Ziya. I’ll find Vladimir my own way.
Ziya Dakhilov: No, wait! I don’t know where he is exactly, but where he might be.
Renee Walker: Tell me.
Ziya Dakhilov: No, I’ll take you there myself.
Renee Walker: You have a car?
Ziya Dakhilov: I have truck; it’s parked out back.
Renee Walker: All right, I’ll drive. Come on!
Jack Bauer: (phone rings) Yeah?
Chloe O’Brian: Jack, I just found out in my background check that Ziya has a probation officer. How do you wanna handle this?
Jack Bauer: You don’t need to.
Chloe O’Brian: He has a tracking bracelet.
Jack Bauer: Not anymore.
Chloe O’Brian: I don’t understand. Those things have anti-tamper mechanisms. You can’t cut them off without triggering an alarm.
Jack Bauer: Yeah, well, trust me, it’s been taken care of.
Chloe O’Brian: Jack, what happened in there?
Jack Bauer: Renee got the result she wanted. Ziya’s taking her to Vladimir.