Aang's eyes followed Momo's trail and widened as they beheld Sokka. And he felt mixed emotions. He's back - after all this time, he's back. There's relief, mixed with fear - Is he still without his heart? and even some hints of anger. Part of the reason Aang had gone so all-out in planning Katara's birthday was because Sokka wasn't there to do it - to come up with some wacky and fun ideas. And more importantly, his absence was so noticeable. He didn't think that everything he pulled out was able to fill the hole left by the absence of Katara's brother at her birthday party.

He starts to rise to his feet, while talking hesitantly.

"Sokka?"