He's taken completely by surprise by the familiar voice. The water he was holding up fell to the river with a splash as there was just a brief surge in his heart from the voice. He turned to face her, but as he did so he knew from her words that she still wasn't herself.

It was hard to look at her now, now that Sokka had told him his thoughts about exactly who she is. And he felt a deep guilt from thinking about it. And now that she'd seen him Waterbending... it couldn't be long before the full truth came up. But he tried to summon a meek smile to greet her with.

"Sorry. It - It didn't really come up."