Sokka sighed. As if watching his sister led away by Fire Nation soldiers weren't bad enough, Aang's sad-puppy eyes were getting annoying. True, Aang wasn't facing him, but Sokka knew him well enough to picture his exact expression.
"She'll be fine, Aang," he reassured, half-believing himself. "Katara knows what she's doing."
He barely heard Aang's reply. "I hope so."
Barely believing himself, Sokka scrambled over the saddle onto Appa's head, sliding his arm around Aang's shoulders. "It's okay. Believe in her – and us." With his other hand, Sokka whipped out his boomerang. "We got this!"
Finally, Aang smiled. "Thanks, Sokka."
This continues a scene that was started in the episode itself. Because Aang and Sokka don't just sit in silence when Katara's not there.