There are few, who have unique skills, that go beyond the normal 5 senses. I had a friend who had a strong sense of smell. Blood Hound Mary, could smell someone coming before they hit the door .Cause they had stepped in some  'dog poop,' they weren't aware of.She could sniff out  a 'fart', BEFORE it left the chute. The SBDs, silent but deadly, or the 'regular escapees,' Marys, Radar Nostrils, were like super heroes!