Answer: forming quick appraisals during threatening or fear-inducing situations
The amygdala is fundamental for self-preservation, being the part of the brain capable of identifying danger, generating fear and anxiety. With those signals the person is put in a alert state, getting ready to run or fight. When the amygdala is damaged, the person won't be able to detect it's in danger, and their body won't be ready for the situation that's presented.