Strange, I'm loving where Art and Raylan are at. We started with Raylan being a loose cannon, someone who may or may not be "Justified" in his deadly force. That Art basically treated him as a useful problem child needed to change — I love that he's still willing to bear with him (he's still effective, you need to support your men) but he's utterly against his direct involvement in the Tonin murder. Had Art continued with an "aww, shucks, he's in gray territory but I mostly trust him" attitude it could get very boring.
(I have questions about Raylan gaming the radio shows for money; while strictly not illegal, it seems to go beyond his values of transgressing the rules for what is morally "Just.")
I thought the interplay really started to turn in this episode, the standstill started to break: with Art being utterly resigned to Raylan's behavior (would it really matter if he shot Danny down or if it was an accidental non-gun death not at Raylan's hands). And then... as Raylan is leaving his office, you get the sense of: "Good, this is what I want, complete indifference from my boss as to what I do." But you now there is an undercurrent of both of them wanting reconciliation and something needing to break. This is what Raylan always seems to want (indifference) from his family, women, and job; but when he gets it, he realizes he actually needs more.
Also, really enjoy that Raylan hasn't played the gunslinger. I remember in the first season, after several one-off episodes, I was worried that every episode would end in a draw-off at high noon... They played with the convention well enough to produce a number of entertaining variations that stayed fresh and self-aware but it could easily wear thin. I thought the 21 ft rule myth was a great way to play with the convention and keep things fresh.