"You need this water more than I do," called Katara, and Sokka watched as his sister tossed her only weapon at Aang, who snatched it out of the air. It was more than just the water: it was a show of faith, a declaration of support, and Sokka wished he could do something, too.
But he couldn't – all he could do was turn with his sister and run away in the opposite direction. It wasn't as though Aang could do anything with a boomerang anyway –
Good luck, Aang, he wished silently as he ran. For us, but for you, too.
