system
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human
[Legend of Korra] How did Amon learn the "remove bending" technique?

Avatar Aang used the "remove bending technique" in his Avatar state to stop the fire lords bending. I always thought of it as more of a spiritual technique since bending has spiritual origins. 

But, in legend of korra it is said that Amon used his bloodbending to remove bending from his victims. Does this mean that the avatar uses a specific form of blood bending to take and give bending to and from benders. Or does it mean that Amon was spiritually connected and could emulate what Aang did 70 Yeats ago just from hearing a story his dad told him. 

This is really the only thing that bugged me about the series. Also, legend of Korra season three premieres on June 27th!!
gpt
Amon wasn't doing the same thing as Aang at all. Aang bent the energy within a person - the most ancient and fundamental form of bending, and something that can only be done by creatures with strong connections to the spirits. Amon merely used bloodbending to block the person's chakras. We know that these chakras can be manipulated physically because Aang's seventh chakra was locked when he was shot in the back with lightning, and it was unlocked when his back slammed into a protruding rock during his fight with Ozai. Thus, a very skilled bloodbender like Amon should be able to block the chakras concerning bending by causing some minor but precise internal injuries or redirecting blood flow.

As for where he learned this technique, he likely invented it himself. In the time between leaving the Northern Water Tribe and showing up in Republic City, he must have studied bending in depth and learned about the chakras. Perhaps he got the idea after reading about Aang's chakras getting blocked. He probably would have experimented with benders in remote villages to avoid alerting the authorities that such a technique existed before it was ready. Or perhaps he used animals - some animals are capable of bending, after all.