History Fridge / DoctorWhoS35E5TheGirlWhoDied

* The villagers refuse to flee the Mire, since they'd have to abandon their village to do so, and it would be destroyed. They destroy large portions of their village during their training, but nobody revisits the idea of running.
** They destroyed some of the village ''property''. They're a rural culture; the surrounding land and harbor are as much their "home" as their houses, and they didn't burn those.

* The Doctor has an epiphany that he'd adopted the face of a man he'd rescued from Pompeii because his subconscious was reminding him that he's the guy who "saves people". It's possible that there's more to it than that: his subconscious may have been trying to reassure him that he'd successfully ''saved'' his ''own'' people. We know the Curator told Eleven that the Cup-A-Soup ploy in "Day of the Doctor" had succeeded, but we also know that younger Doctors don't remember the details of his encounters with his previous selves. Once Eleven had forgotten their conversation, he couldn't be '''certain''' that Gallifrey still existed; even the message from "Time of the Doctor" could've been a last, desperate signal sent out across all Time and Space just before the Cup-A-Soup effect failed and his home planet was erased forever. But when the Crack opened and he received a new infusion of regeneration-energy, the Doctor's subconscious recollection of the Curator latched onto that influx of energy, and locked in a face that would strengthen his faith that his three previous selves' ploy had worked, just as his past effort to save Caecilius's family succeeded. Indeed, he's a lot more confident that Gallifrey's rescue ''did'' work when he talks to Davros earlier this season, suggesting that his face's significance had already taken intuitive hold over his psyche, even before he'd consciously worked out where he'd seen that face before.

** They destroyed some of the village ''property''. They're a rural culture; the surrounding land and harbor are as much their "home" as their houses, and they didn't burn those.

* The villagers refuse to flee the Mire, since they'd have to abandon their village to do so, and it would be destroyed. They destroy large portions of their village during their training, but nobody revisits the idea of running.

If Ashildr is now practically immortal, then it's quite possible the Doctor might have seen her in passing at some point in his past, her future -- perhaps even more than once. He has spent a ''lot'' of time in Western Europe, after all. He may not have actually met her, but he already showed when he spotted Clara in a crowd that he is at least on some level aware of everyone around him. A few glimpses throughout time might get her face into his subconscious enough to catch his attention when he saw her now.