Fear was a very random thing.
Not only does it vary from person to person, but even the same person would fear different things at different stages of their life.
For example, Sanzi was scared of the dark when he was an infant, but when he was a little older, he was afraid of Wang Heizai, a child from Siqiao Village, and of dried fish bones that had their meat completely shaved away. And even now that he had become a powerful contestant, he would still run away whenever he saw a toad for some reason.
When fear rose in the heart of a person with a resolute mind like Sheyan, even he could not help asking himself: 'Why do I fear this creature?' But he could find no answer to this question. In other words, he was afraid for no discernable reason!
Thus, Sheyan immediately knew that this unexplainable fear must stem from the effect of some kind of weird ability. This was to be expected. A creature that the Queen of Blades believed could finish him must have some abilities.