Sarcasm is an adjusted stress reaction.

I can so see Zuko repeat that lesson to Sokka in all earnestness and being laughed out of the air temple.

And that awkward conversation between Zuko's reunion with Iroh and going off to fight Azula, where he's all like, "Quick check, you're not my biological father, are you?"

And Piandao goes, "...No."

"Wow, that's a load off my mind."

"Your sister, on the other hand..."

Do you happen to know where I can find a detailed description of the stuff in the comic? I ordered my copy but have no patience whatsoever.

Nope. I saw some actual download links on Tumblr, but I just had a quick squiz, and the Airbender tag is full of bad porny fan art.