This was territory Mark would much rather bury. His gaze snaps up, not offended, just surprised. Mildly insulted, but only mildly--he knows Billy probably doesn't realize it's a sensitive, sore subject. A wound that hasn't quite healed. It's not his fault.

Still, though. Mark inhales a little sharper than he should, responds a little too fast, a little too defensive. Sure Billy didn't mean it, but his work was his life.

"I don't hide," He says far more briskly than he intended to. He's had this conversation with Roger, too. "I'm creating. You think CHAOS is hiding behind a sound booth to make him feel better, or because he likes what he does?"