Zuko is quiet for several moments, not really sure what to say. He can't relate to what she's going through. He's not exactly good at making inspiring speeches full of hope. That would be Katara's job. But at the moment, it's just him, and he feels like he should do something. Anything, that would let Toph know that he was there for her, and would do what he could to help her.

She couldn't see, but maybe appealing to one of her other senses would help. So he reached out and took her hand. He might pay for this later. She might hit him. But that was okay. As long as it got the message across.