Aang knows all too well what it's like to feel trapped by the healing process, and so when Katara mentioned wanting to get outside for a little while, he was more than happy to help make that happen.

In truth, there's precious little that Aang is capable of saying No to, when Katara is involved.

Just...feel free to ignore any and all subtle earthbending done in the effort of making the path they walk towards the river easier for her to manage.