What is up with Nocturnes fear?

Legit, he, AN ASSASIN, can fear for 2.25 seconds? thats longer than my wife took to give birth to my daughter, thats longer than it took for Donald Trump to make peace in Korea, even longer than it took for Hugh Grant in Bridget Jones' diary to realise she was in love with him, and thats a long time. AND HES AN ASSASIN. He deals more dmg than a truck going full speed into a bus full of kindergartners in the time it takes to realise how much you hate the champ. AND THEN HE CAN FEAR? AND WHAT AM I EVEN FEARING? hes literally the tail of a rattlesnake but with arms, its literally like a caterpillar made of shadows, like legit, if you were walking in the night, all alone, its kinda chilly, the midnight darkness surrounds you, suddenly a shade, ITS A CATERPILLAR, would you be scared? like legit?