I always think of him as the skeptical Captain to Feed Thompson's Admiral in The Hunt for Red October.
The blackmail of the FBI director did feel not well thought out as did his initial decision to confess to the murder to save Joan. Considering how viciously he ripped into Mycroft for his decision to go to the NSA to resolve that issue, it is all the more baffling.
I wonder if that confession the FBI director will come up again. It seemed he set up as blackmail against blackmail, if you say this I say that, but what happens to it if he dies? Is Joan going to be a suspect again?