Alexander Gordon Smith said this quote

When you're scared - and I mean really scared, not just hearing a noise in the night, or standing toe to toe with someone twice your size who wants to pound you into the earth - it feels as if you're being injected with darkness. It's like black water as cold as ice settling in your body where your blood and marrow used to be, pushing every other feeling out as it fills you from your feet to your scalp. It leaves you with nothing.