It's all AU.

The Doctor was. Unsettled. There was something distinctly new and unfamiliar about the Master's latest incarnation, and even Jack had seen it.

He went looking for someone old and familiar. Sat down in the chair next to the Master of about seven centuries ago, who was reading in a corner of the library, and said, "I owe you a game of chess."

The Doctor spied a familiar figure in black - as opposed to the less familiar ones around - and said, conversationally, "You're still here."

He was, frankly, grateful for someone here he actually felt he knew.

After leaving Benton, the Master had thinking to do. Or thinking to avoid, that sounded like a better option. He wanted away from people, but he really didn't want to be cooped up in his TARDIS. He started walking, and ended up out at the lake. Which seemed like the right kind of quiet.

The Master was bored, and looking in shop windows. Hmm, electronics components. Might be some potential for distraction there.

The Master left the library and started walking, without really caring where he was going. He just needed to be moving. Either that or he needed to go back to his TARDIS until this place decided to send him back where he came from, he hadn't decided yet. For now, walking would do.

The Master was sitting the in the library, reading War of the Worlds. Because it was amusing. 'Intellects vast and cool and unsympathetic' indeed.

The Master had left the tea shop and gone straight back to his TARDIS, to see for himself what happened if he tried to leave. Once he'd worked out that short hops in space were possible, he'd moved his TARDIS close to the perimeter.

He was standing by the barrier and trying to figure out the best way to analyze it, when he heard someone approach. Well, not just someone--another version of himself. Oh, this day was just getting better and better.

Well. That was strange. He'd gone from a place outside of normal space but encompassing time itself to...somewhere outside of time altogether? He checked the readings again, ran a couple of diagnostics in case Miss Grant's ill-advised actions had damaged something, and finally decided that he wasn't going to get any answers from inside his TARDIS. He stepped out onto a sidewalk in what looked a bit like 20th century Earth, but certainly didn't feel like it.

He glanced back at the TARDIS, which had remained in the shape of a large 1970s set of computer banks. Whether the chameleon circuit was malfunctioning (which would be embarrassing) or whether his ship couldn't get enough of a sense of place to work out what to disguise itself as, he didn't know. He set off down the sidewalk, hoping to find some answers.