Sort of comes from an AU where it's modern and Aang's people die and then he's in the back of a truck because they suppose they gotta keep him alive but Just Barely (you better know that quote) and... yeah. This is when he's being very stuck and afraid and alone.

Can you hear them? They're screaming. They're screaming, and they want me to save them. Can you hear them? No? Why not? Why can't you hear them? They need help - they need my help - they need it now. Please, could you let me go, for just one minute? Just one short minute. I need to save them. I need to help them. No? No? Why not? Why - not - I - help - them - ineedtohelpthem - please -

I can't hear them anymore. They've been quiet for the past few… for a while. They've been quiet, but sometimes I can hear them, but I know they're not real. You could let me go, now. I understand that you killed them: that they can't come back. I get it; I really do. I can't save them. There's no reason to keep me here anymore. Please, you could let me go, you really could, I wouldn't go home, I wouldn't even try, I can't hear them, I wouldn't bother you, please, I wouldn't fight you, you could let me go, you could let me go, you could -

I can hear them screaming. They're angry I couldn't save them. I need to avenge them. But I can't. I'm stuck here. I can hear them screaming. They're angry I couldn't save them. I need to avenge them. But I can't. I'm stuck here. I can hear them screaming they're angry I couldn't save them I need to avenge them BUT I CAN'T I'M STUCK HERE I CAN HEAR THEM -

Can you hear them? Because I can't. I can't hear anything. I think they're past anger, now. They've left me. Maybe they'll go to you, and haunt you. Maybe then you'll let me go. I'm ready to leave. I've been ready for the past… really long time. But that doesn't matter. I can't hear them anymore. I think they must have given up, on me, or themselves, or on something else. It doesn't matter, though. It only matters if you decide to let me go.

Silence.

I can't hear anything. I can't feel anything. If you want to let me go, I want to leave. If not, then fine. I'll just stay here, silently. I can't hear anything. I wish I could, but all I can hear is my own heart, and I can hear it through everything. My breath. My hand. My toe. My blood. All I can hear is my heart.

I lied. I can hear screaming, too. But I don't think it belongs to them. That's just… it's just me.