[He gasps, eyes going even wider, bows lifting higher.] Most fascinating..! You actually turned it to ice!

[The Headmaster straightens then and strokes his chin in thought over the information she's just shared about the other elemental abilities the other cadets from her world possess.]

I remember the one Cadet, yes. He was the one who was brought in for fighting with with you upon arriving, correct?

Cadet Aang, Cadet Zuko, Cadet Toph, and Cadet Azula. Hmmm...