Aang pays little mind to Sokka's absense - he was hurt after all, he needed to get treated. He does panic as Korra shoots fire at Ed.

"Korra, don't hurt him!" It was still Ed, after all. His friend, even if he was possessed. Aang opts to use airbending-assisted hops to avoid the shadows and gets close enough to Ed to blast a wind that could he hopes will push him over.