It wasn’t fear; it was shame.

If he were to tell you himself, he has never experienced fear. And if he were to tell you why, he would say that he has never known the feeling, the emotion, the plague. But what he would not be so willing to share would be the impetus behind his lack of fear, his lack of normal human experience, and the obvious answer is simply that he is not human. No educated reader, however, would take this as a good explanation or effective explanation. To which he would coolly reply, “So what.”