All Mako wanted to do was protect Korra but instead she got hurt and he almost did too but she saved him. He’s the reason she airbended. Amon might have helped Korra by accidentally making it easier for her to unlocking her airbending. But when she saw Mako the one she was friends with, trained with, bonded with and of course had a huge crush on. About to get his bending taken away by Amon it was Korra’s selfless internal instinct to immediately save Mako. After she defeated Amon, Mako tried to attack him but all Amon did was flee. Then Mako looks right at her. He opens his arms so Korra can feel safe. It’s all she needed in that moment. He was her support and her everything.