Good question. Studying his follower, Harry realised how stiff he was holding himself. Oh, to an outsider, he appeared perfectly at ease, gesturing on occasion, smiling brightly. But his smiles rarely reached his eyes, and whenever someone came closer, he always pulled back as if he was afraid of skin-to-skin contact. Luna pulled him out of his musings when she asked, "Can you only transfer energy or amplify it as well?"