Or for you aviation folks, a cessna can also try to combat with a cessna, however while challenged by a b747, she's off in the different direction. Your herbal "combat or flight" response is quite efficient at strength protection. It is what helps you live to tell the tale. You start to sweat, your muscular tissues disturbing, and your hearing sharpens. You are now notably alert. Awareness and focus on whatever else is prevented. The apprehensive system receives a flood of adrenaline (epinephrine).