The Lion-Turtle
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The Lion-Turtle
Artist: Yuumei TCG Player Link Scryfall Link EDHREC Link

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I can see where you're coming from, and you definitely make very good points. But I think Aang's indecisiveness works, because he's pretty much being told by nearly all sides that he's going to have to kill Ozai, by people he trusts, so of course it's going to make him seriously doubt himself and his conviction. But I didn't really see his sparing Ozai the lightning as an act of fear as it was his conscience and principles leaping up and stopping an instinctive, lethal act of self-defense.
As I said in the last post, it all comes down to imagery. Aang's eyes widen in horror, he turns away in guilt... his body language reads "emotional reaction," and it kind of drowns out the much more subtle philosophical considerations.
With the pressure that Aang's facing, it does make sense for him to question himself, but the problem is that if he's questioning himself, the implication is that the lion-turtle is there to save him from falling to peer pressure than to validate his decision to stand his ground. It's a different dynamic, and the latter is a far more active and heroic one.
About bending. In AtLA, they infer that humans learned bending from animals that had a connection with that element. In LoK, they introduce the Lion turtles an giver of element, until Vaatu was defeated, and the portal closed. Your thoughts?
I think the easiest way to synthesize the two explanations is to say that humanity gained power over the elements through the lion-turtles' gift, and learned how to bend from the animal masters.
We see that a bit with Wan, actually: he was given the power of fire from the lion-turtle, but he learned how to use it as an extension of himself from a dragon (the animal master for firebending). It seems plausible that the bending arts were codified at different times based on the teachings of the animal masters, as people started realizing that the power of the elements were more than just blunt implements to be used as weapons.
The Omashu story is easier to explain away as a legend, since it must have been far closer in time to Korra's time than to Wan's and I can't imagine earthbending lacking an official form for that long... but that's not the only option. It's possible that the power of the elements were at some point lost and forgotten among certain groups (the Earth Kingdom, at Oma and Shu's time, would have been a collection of warring tribes or states rather than a single whole, so Oma and Shu's people may have been completely unaware of earthbending even if it existed elsewhere on the continent) and the powers were revitalized via lessons from the animal masters, with the original origins being lost to time, for instance.
Okay, I've been rewatching Beginnings for kicks and when I heard Raava and Wan speaking to one of the lion turtles Raava calls one of them "ancient one", that's pretty cryptic since Raava has evidently lived for a millennia, even before humanity as Vaatu put it "crawled out the mud". How old do you thinks the lion turtles are?
I actually discussed this recently, but to recap -- I'm not sure if it's possible to assume by Raava's statement that the lion-turtles are actually older than she is, though that seems like one possibility.Â
The only way I can see them being older than Raava, though, is if they're incarnations of the world itself, taking form as a physical being to protect the world's interests. I sort of doubt that's what was actually intended, but I find that explanation pretty compelling, because it would explain why they were so interested in saving humanity, why they disappeared as soon as they were no longer needed, and why one appeared to assist Aang when the fate of the world was at stake.
The other option is that the lion-turtles are simply the oldest physical creatures out there, dating back to the time when life first arose on the planet. They'd still have to be millions of years old for Raava to consider them ancient, though, given that she herself is probably something like 100 million years old (Vaatu's "ten thousand lifetimes" times ten thousand years each) -- to say she lived for a millennium is selling her short by several orders of magnitude. ;)