Katara giving her words of wisdom to Korra and Tenzin before they depart on their journeys.
Since you ask, I'll try to sum up a lot; Sasuke needs to be put in his place and Karin is the type of "take no shit" woman who will stand up to Sasuke and call him out when he is wrong. SS has ruined both Sakura and Sasuke as terrible people. Karin understands Sasuke. Sakura does not. Karin protests against Sasuke while Sakura begs. Sarada deserves better parents then who Sasuke and Sakura turned into. Gaiden made SS even worse then it was, which is quite a feat!