[He just gives an acknowledging nod at Malfoy's explanation while continuing to pet Edge and perks up at the mention of Katara. There would have been a very different tone if had known what actually happened in that encounter.]
Oh, you met Katara? She's my- also one of my best friends! That sounds great, she is a master Waterbender.
[Action]
Oh, you met Katara? She's my- also one of my best friends! That sounds great, she is a master Waterbender.