I think the Amon really is Bumi (Aang and Katara's son), and because he was the only non-bender in his family (His father Aang was an airbender,mother Katara-waterbender,brother Tenzin-airbender,sister Kya-waterbender) he may hold a grudge against benders. And as he is Aangs son he could have inherited his fathers ability to take bending away, like Tarrlok inherited his fathers, Yakone's power to bloodbend without full moon.

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