Re: The Legend of Korra - Book One: Air
I think that the whole episode for Korra dealt with her unlocking the first Chakra
, Survival by admitting her fear of Amon. I think this because of the flashbacks she saw of Aang and the Gaang fighting Yukon in Republic City after Amon knocked her out. She started to connect with her spiritual side.
In fact I'd go as far to say that Amon deliberately set up the situation on Avatar Aang Memorial Island to unlock her chakra.