I just realized something! I bet the Writers were watching Star Wars: Episode VI: Return of the Jedi before writing the season finale as there are many similarities.
Korra is captured by Tarlock- Luke is captured by Vader.
Korra thinks Tarlock is evil, then he expresses remorse for what he did to Korra. Luke thinks Vader is good, but Vader expresses no remorse until Palpatine uses force-lightning on Luke.
Then Vader sacrifices himself to kill Emperor Palpatine. TARLOCK SACRIFICES HIMSELF TO KILL AMON!!!!!!
Anyone else notice this?