I, honestly, think he's just an entire new character. How he deals with bending combat-wise, just by dodging the moves head on as well as actually moving around them like an actual bender, I believe he has an advanced knowledge of the arts; probably from studying it meticulously most of his life, or having a huge quarry of self-experience.

Just by him being a chi-blocker himself, I'm going to go with the more relatable fact that he's permanently(?) blocking off chakra pathways. I mean, when Aang was studying under Guru Pathik, he, at the time, couldn't bend fire because his pathway was blocked off. Going by the theory that Amon studied the combat of Bending to the point that if he was one, he'd be a master, I'm going to make it go hand-in-hand that he also spent a large amount of his life studying the art of Chi-Blocking. I believe it was just for the fact that as a nonbender, he could defend and be a formidable foe against benders, but then he discovered an ancient chi-blocking technique that permanently blocks pathways (I remember reading from Bryan and Mike that Chi-Blockers were just as ancient the White Lotus, so the fact there maybe an ancient technique is not unfathomable).

I am, too! There's no way you can just smash together such a beautiful ending to a great season in 30 minutes. _{I want to know what's going to happeeeeeennn!!}