There is a vague sense of discomfort at the request to pass on a message to X that Devin can't quite place. Maybe it's that he now cannot avoid engaging with X at his workplace full stop, despite his intentions to do just that; or, maybe it's the implied familiarity that X and the Fool have, that Devin lacks even in this utterly benign role as a brief link between them.

He'll chalk it up to his generally poor social skills. If there's anything else informing the reaction, Devin isn't inclined to examine it at the moment (or in the foreseeable future).

"I will, if only for a respite from his constant chattering," he replies. The words could easily carry an edge, but here it's clearly meant as gentle ribbing. X means well, however annoying Devin finds his hovering. Devin trails after the Fool to the door, hesitating over what else to say - the evening has not gone entirely as expected.

All he can think of in a reasonable timeframe is, "Good night, Fool."