Maybe I'm way off target here, but if it's something you're feeling every time...and it's something you don't see in him when he's ending with other patients, maybe this is a feeling that's coming from you and not something that's originating with T. I know you're describing it as T disengaging and certainly you must be sensing it as that. However, have you considered that it might not be T that is turning the switch off at the end of the session? Or maybe you are flipping the switch for him?

Like I said, I could be way off target with that. It's just that I've noticed that when I get really sensitive to something that I perceive as another person's reaction, it usually comes back to being my own problem.

Best of luck resolving this feeling.