I'm jumping ahead a little - but will hop back to do the earlier episodes as well. I just wanted to post about this episode first because I was thinking about something and wanted to write it while the thought occurred to me ...
At the beginning of the episode, Dar Adal and Saul are meeting for breakfast and we learn a lot more than we have known about Peter Quinn's background.
Dar Adal: Peter Quinn is one of mine.
Saul: Why would Estes put a off-the-book black ops guy in charge of a straight-up intelligence operation?
Dar Adal: He didn't tell me; he just asked for a soldier.
Saul: Soldiers kill people.
Dar Adal: They also fix airplane engines and cook bad food-- it was a figure of speech. Maybe Estes put Quinn in there just to keep his eye on you. Maybe he doesn't trust you.
Saul: Why wouldn't he trust me?
Dar Adal: You still afraid to get your hands dirty, Saul?
Saul:I still prefer to figure the problem out, not obliterate it.
Dar Adal: You're too sensitive for this line of work, you always have been. I'm amazed you've lasted this long.
Saul:Me, too.
*
Later, back at Langley, Quinn's standing with the other staff and Virgil and Saul are whispering about him...
Virgil: Find Adal? What did he say?
Saul: Quinn is one of his.
Virgil: Virgil: So what's he doing here?
Saul: That's a good question.
*
Saul then has a discussion with Estes.
Saul: I had a talk with Dar Adal. He confirmed that Peter Quinn, or whatever his real name is, comes from his side of things. So again I ask... What's he doing on my operation?
Estes: His operation, Saul. It's his operation.
Estes: And now it's over.
Saul: Is it?
Estes: Yes.
Saul: Why is he still here? Brody knows that you and Walden ordered a drone strike against a madrassa full of kids.
Estes: So?
Saul: So it could be that Quinn's an insurance policy against that information ever becoming public. An insurance policy?
Estes: Just what exactly are you implying?
Saul: Only that you and Walden went to great lengths once before to cover up the drone strike.
Estes: Is this an accusation?
Saul: I'm only asking a question, David.
Estes: Well, goddamn it, Saul, I'm not gonna dignify it with answer.
Saul: Is that a yes?
Estes: Fuck you, Saul. Fuck you!
Can I say I have a lot of difficulty taking David Harewood seriously right now given that I'm watching him in Selfie and he plays a comedic boffin in that :P
Anyway, at that point, Quinn comes up and asks exactly the same thing he asks in 4.12: "Am I interrupting?"
Estes: No. What's up?
Quinn: Carrie's been in an accident. DC police found her car on 17th Street all smashed up. It was broad-sided.
Saul: Is she hurt?
Quinn: They can't find her.
Estes: What do you mean, they can't find her?
Quinn: She's not there. They're looking in local hospitals.
Estes: (at Saul) Get over to 17th Street.
Quinn is clearly genuinely worried about Carrie - it's not an act. He looks worried, he looks shaken. After Saul runs off, Estes says to Quinn: "He knows." Estes is worried about discovery, but I think Quinn's actually still worried about Carrie ...
*
Later in the episode, here he is with Saul and Virgin trying to figure out what's happened to Carrie.
Virgil: That's Nazir less than 20 minutes before Carrie's accident. Security cameras caught him. That's his car. We traced the license plate. He probably used a fake ID; it's a rental.
Saul: Where is this place?
Virgil: Five blocks from where Carrie's car was hit on 17th Street.
Galvez walks in
Quinn: What the fuck you doing here? You're supposed to be in Walter Reed.
Galvez: I heard about Carrie. I want to help.
Virgil: Here, take a look at this.
*
Later, when Carrie calls Saul, everyone scrambles, including Quinn. He's running along, pulling his jacket on.
Here he is adjusting the light for Saul ... he's so intent and worried about Carrie :)
Again, Estes is just worried about saving his own skin, Quinn is worried (like the others are) about Carrie.
I've written before about Quinn's
Turning Point i.e. when he started turning away from the dark side and wanting to see things differently.
I think that Estes brings him in to pretend to be an analyst leading the Brody surveillance operation. As time passes, he 'pretends' so well, he doesn't just act like a member of the team, he becomes a member of the team. He works with Saul, Max, Virgil, Galvez and most of all Carrie and learns to admire and respect them. I once mentioned that I thought Quinn saw Saul as a mentor. Dar Adal sees himself as Quinn's master and owner, Quinn clearly has no respect for Estes but I think he respected and may have even liked Saul and he certainly admired and liked Carrie.
Unfortunately I don't much care for Saul anymore but I still think it stands that Quinn started forgetting that this was just an act and he actually started believing in what he was doing and perhaps even liking the work. If Quinn had been asked to kill Brody earlier in the season, he probably would have done it, but by episode 10, he was already part of the team and could no longer just assassinate Brody without thinking about the consequences to Carrie.