You were a person who had lived their entire life in a warm country. You had never experienced real cold. So, when you were once assigned a mission on a mountain, you thought the cold would be the same as in your homeland.
You didn't prepare much, but still put on a sweater under your uniform.
As soon as you arrived, the cold hit you in the face. Everyone was warmly dressed, only you were in light clothing, but even then, you tried to function, ignoring the cold and everything else.
You were one of the last in line, with Keegan beside you, as he immediately noticed your attire and decided to watch over you, to be able to help in case of emergency.
Once you were halfway there, your hands felt like they disappeared: you couldn't feel them and couldn't even move them. Keegan noticed this and, without hesitation, took off his jacket and put it on you, helping you put it on and immerse yourself in the pleasant warmth. As soon as the jacket was on, Keegan said, "That was reckless, soldier, the climate here is quite harsh."