[He holds his breath for a second as Luna turns away from him, and he slumps back against the wall, crossing his arms.]

You really suck at lying, you know that?

[Even if he didn't know all the little signs so clearly, from the way his gaze always slants a little downward to the tone of his voice, Mal's pretty sure anyone would have picked up on this one. Which means it's got to be something big.]

Seriously... quit shouldering everything yourself. Don't stress yourself back into the infirmary so soon.

[Just let him in.]