[He is silent during her explanation. Then he takes a few steps back from the riverbank and sits down in the grass, curling his arms around his knees and wrapping himself in his cape.]

...I think I have your evidence. Right here.

[He pulls something from the folds of his cape and tosses it towards Katara precisely to land a few feet from her. It opens to a bookmarked page showing Avatar Aang's introduction to Luceti. There are various other bookmarks throughout the book.]

He's... that me... was the only one you met by that fountain that day. Wasn't he.