"Because while we're here, our worlds are frozen in time. Which can really get to a person's head, but that's a different story."

She hoped that's what he meant by 'paradox.' Diana was only about ninety percent sure what the word actually meant, outside of the Gilbert and Sullivan use.

"For example," she said, "my friend Draco is here. And there's another guy from his world too. Harry. But Harry has no memory of Draco ever disappearing from his world. And vice versa."