In The Last Airbender, we look at what some say is the worst episode of book one. In Korra we have bloodbending and fartbending. Which is more horrifying to watch? Right now it's time for tons of flashbacks and nothing of substance.
ATLA: Book 1 Episode 11 "The Great Divide"
ATLA: Book 1 Episode 12 "The Storm"
LoK: Book 1 Episode 9 "Out of the Past"
LoK: Book 1 Episode 10 "Turning the Tides"