Dementors didn’t reckon humans well, sensing magic better than they understood features, and had been able to identify Harry by only a few aspects: a level of power they’d seen only in Marvolo or Dumbledore in recent years, a touch of magic that felt like Marvolo and drew them towards the boy out of curiosity, and his general life force, which gave them an approximate life span. The first interaction seemed simple enough, with another person, a wolf-person according to Finstarnessi, scaring off one of the clan during the train ride to Hogwarts. (That really must be Remus Lupin.) It was the second interaction, on the Quidditch Pitch, and then the third in the Forbidden Forest that were upsetting. Not only had Harry come within a hair’s breadth of being Kissed but a second version of him -- and why had Dumbledore given a child a Time-Turner, really? -- had conjured a corporeal Patronus.