[ there's a lot to pick apart in here, and katsa isn't quite sure where to start. she wants to ask about why zuko's mother needed to be found int he first place, to start, but he's focused on the memories and the remembering. katsa can't read zuko as well, but she knows that it has been distressing for po not to remember his last stay in the drabwurld, and perhaps that's similar. she hasn't experienced the things he has, either. ]

Zuko. Did you know Po is in Allaidh Darach again? Only he's older—eight years older than he last was. Eight years that I've not lived but he remembers, but he doesn't remember that he's ever been here before himself.

[ it isn't exactly meant to comfort him, and it seems extremely off-topic in the way she presents it. but there's a reason to her bringing it up as she does, an awkward way at least of saying that he isn't the only one who doesn't remember things, and that something in this goes far beyond what she understands. ]