Here's some more storyboards i boarded of as staff at STUDIO MIR in Korea in 2010, EPISODE 10: "TURNING THE TIDES" I believe this bit is from ACT 3 where Amon and the Equalists attack Air Temple Island.
Here, Lin attempts to defend the last Air Benders from the Lieutenant and The Equalists as Pema is about to give birth to Rohan. What many of you who've seen this episode notices is that this is the first version before final edits. So you will see sequences here that were cut in the final aired on TV for running time or other reasons.