Astrid blinks, several replies about anything from the picture to the actual date coming to mind before she puts two and two together--he used to be called 'September.' He had a colleague called 'August.' It only stands to reason....

"He's one of the original Observers?" she asks.

But....

"But don't they all not exist, now?" she finishes, hopelessly tangling the temporal grammar.

This is still a bit beyond her--causality is beyond most people, really.