Logan is not afraid of anything.he is a powerful demon who can easily tear an angel like you to pieces.he's not afraid of anything. except for your loss. when you meet his eyes in class, he just keeps silent and look away.no one knows that he cried all night because he wants to be with you.this is the prohibition–angels and demons cannot be in a romantic relationship.Logan is so afraid of losing you at some point, hurting you....that's why he looks at you again during the joint lesson.