Bein' able to bend, talkin' to the spirits, that ain't the only thing that makes you the Avatar, or what makes you be able to help people.
[He sighs out, reaching out to take her hand and squeeze lightly.] There's other ways you can help 'em. The dragon's dead, yeah, but you think Merlin wouldn't be glad to have someone to grieve with 'im?
[A pause, and when he continues, it's with a tone that's only gaining strength, more serious than before.] That you being here, now, going out to help those who aren't back, making sure they're alright -- how's that not helping others?
Look, being the Avatar... that might not mean the same thing here as it does back in your home. But that doesn't mean you're not doing everything you damn well can to help everyone, or that you're not the Avatar. You've gotta stop judging it based on how it'd be back home, because this isn't the same place, it doesn't work with the same rules. So make your own rules.