"What do you need boy robes for?" inquires Madam Malkins.
"I'm sometimes a boy," the girl explains.
"What?"
"Look—"
She shrugs. "I'm gonna fix Slytherin and I'm gonna make portraits able to leave their frames and I'm gonna figure out how to make everyone immortal."
"Which are very ambitious goals and if you achieve them I'm sure lots of people will be thankful." Pause. "But don't go into anything dark."
Pause. "Like that war I told you about. The guy who led it – he was dark, killed people and, uh, Unforgivables. Things like that."
"… Right, uh, they–" Pause. "It's– uh. The Killing Curse, Imperius Curse and Cruciatus Curse." He looks around, possibly checking that nobody's listening, and says, "First one is, I think, clear, second is – you can control people to do what you tell them to. Third is for torture."
"Evil stuff, yes, but – dark is a sort of specific category? You can be evil without using dark spells, you could, I don't know, levitate someone off a cliff, and there are other dark spells, but they're the Unforgivables."
"I guess it makes sense that spells that are only for hurting other people would be unforgivable..."
"There are some other spells, like – a really uncontrolled fire, which is dark but it's not an Unforgivable. And probably others I don't know because I'm too young."
She nods. "Well I won't do anything dark to make people immortal, that would defeat the whole point."
But Anthony makes sure she knows his floo address! Then realises maybe her house isn't connected to the floo network and she maybe can't contact him anyway.
She's got an owl, though. His name, in case she didn't know, is spelled with a K at the start of Knox.
Woods. It's Woods.
Not that it matters, literally no one else has her first name.