"Well..." Problem wasn't quite what he'd call that. He wondered if Jack ever bothered dressing when he wasn't in his immediate vicinity but decided that it was better for his peace of mind if he didn't find out the answer to that question. The Doctor stepped further into the room, very firmly focusing his eyes on Jack's face and absolutely nowhere else.

...that man had like three times this generation's muscle mass, how was that fair?

"No. No problem. I just..." He hadn't really thought of what to tell Jack, but he realized that for various reasons telling him that he simply couldn't stand the Master's quiet presence anymore wouldn't be the best idea. "Just checking up on you." He found a smile somewhere, after all he had experience in faking those. "Part of the service. I forgot my stewardess uniform."