I think it's because while I like Fritz, and while I like the idea of the pairing, I just don't think that Kyra Sedgwick and Jon Tenney have any chemistry, so I just am meh about them. And then psycho, flame-boy (and very yummy) Jason O'Mara comes back for another visit and THEY have chemistry and the interrogation scene and then the final scene and I'm just like ... man, man, man! They have chemistry.
Oh, why does he have to be a psycho, flame-boy!?!??!