Wow, so The Legend of Korra was only intended to be a mini series? Just one season? I can understand why things were wrapped up so quickly then...a LOT happened, and it was action-packed, sorta rushed though...
I didn't think Amon was Aang's non-bending son Bumi, as confirmed by the second part of the episode...An interesting touch to find out that he was both a water and bloodbender...I thought Amon was just...a highly skilled, Elite chi-blocker...but...I still don't understand how he used bloodbending to take away someone's bending...and was it really permanent removal, because he took Korra's bending, but she was able to bend shortly after that...
Perhaps Amon used blood bending to block the chakra that would normally allow people to bend, blocking that spiritual connection to it...And then they'd have to be healed to restored that spiritual connection...Like stated before, Amon doing that could've possibly been what removed the block that once prevented Korra from Air Bending.
So Korra Air Bends, exposes Amon as a bender, and then he escapes with Tarrlok in a murder-death suicide...that's pretty intense...The spiritual block that once prevented Korra from connecting with Aang and her other past lives was also removed, she gets her bending restored, and gains the ability to energy bend and restore other people's bending (ex Chief Bei-Fong) And then she finally goes into the Avatar state for the 1st time.
That's a lot to take place in only episode...Now I'm thinking, what can they do? Where can they go from here? What new enemy or possible threat can they think of? And what's gonna happen to Asami now that Korra and Mako are officially together?