Your past doesn't define who you are, it just gives your the starting point of who you are going to be. - I'd rather trust and regret than doubt and regret
Touching the Spirit Portal.
This has to be the Northern Portal Korra touches here since she unlocked the Southern Portal already and also the Southern one is blue and the Northern one is reddish purple, as we saw when Wan locked them. (I personally think their color schemes correspond to Raava and Vaatu, respectively South and North.)
So…then…is Korra UNLOCKING THE NORTHERN PORTAL!?!?!