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The Doctor was hovering somewhere between irrationally vaguely irritated and relieved that seeing Jack seemed to have flipped something one in the Master that made him bother to eat and sleep properly. Most of the irritation was at himself, for not manging it earlier, but some at the Master for not responding to the Doctor worrying about him. Well, he was smart enough not to say anything about to the Master about it, and be happy he looked better already.
He milled around the town, pondering how long they might be here, and what they could do to occupy themselves. He was frankly not very interested in finding a way home at the moment. Jamie's father might be right, that they were here for a reason.
Simple, easy, good fun would be setting up some experiments to run with Rose. And if he could get the Master involved, wonderful. He peered into a shop, contemplating lab supplies.