It's all AU.

He'd finally sucked up the courage to go and find Jack. That gun was burning a hole in his pocket and he'd had enough of thinking about it. Time to act.

There was no answer at the other TARDIS when he knocked, but he reckoned everyone had to come home some time. So he sat down on the pavement nearby, leaned back against the wall, and waited.

Jack was on the look-out for someone tall, dark and handsome, who didn't look like himself.

He found someone fitting that description in a coffee-house that had sprung up out of nowhere, and wandered over, eyeing him up with interest. The Doctor and Rose hadn't been lying about the handsomeness.

"The Master, I presume?" he murmured, one eyebrow slightly raised and eyes twinkling.