What does Henri tell John about his newly-emerged Legacy in the novel, I Am Number Four?

Henri tells John that as he hones this Legacy, he will become increasingly resistant to fire and heat. In the meantime, he will have to learn to control his emotions. This proves to be difficult as he sees Mark James and his friends again on his second day. This time, John will not blend in, or ignore. Instead, he demands the return of his phone by day's end. After this encounter, John's right hand begins to glow again. He pulls on the gloves he brought for this reason, and goes to his first class.