[He's still looking at the snowball in his hand which, unfortunately has begun to solidify thanks to the small amount of magic he's been toying with, just to keep it from melting. He grimaces, dropping the now ice ball down onto the ground.]

It makes sense they want us to practice, but this is asking for trouble...

[He glances at Katara, watching her carefully.] What, uh, kind of magic did they give you?