In a threat-type stress response, the body assumes a physical fight will be lost, leading to physiological changes.

“your body's basically assuming you're going to lose whatever physical fight you're in like the bear is going to you know tear you apart and then your main goal at that point is to stay alive and like bleed out more slowly right so you end up with more blood kept centrally in the body cavity Less in the extremities right the body releases cortisol because it's an anti-inflammatory it's going to like help with tissue repair 45 minutes down the road so there a whole like Cascade of physiological responses that come in part from the mental appraisal that this stressor is more than you can handle”