It's all AU.

The Master and the Doctor were. Chasing each other over rooftops with fencing foils. Not the deadly weapons they fought with earlier, because they knew they wanted to run run and they didn't want anyone hurt if they slipped. But the contest, the game, was there. Mostly it was just fun.

The Doctor was pleased to discover he was still the better swordsman, although he wasn't terribly intent on *winning* quite yet. Still, one thing the same. He skidded to a halt and called down a hello to Jack before ducking the Master's next strike. Showing off a bit.