What does Lea do for Harry in Chapter 30?

In Chapter 30, during their battle with the vampires, Harry loses control of himself and his magic, and sets all the vampires in the area ablaze. He and his group would have perished in the flames and smoke, but Lea saves him by making an exit route for them. When Harry asks her why, she explains that he belongs to her, but she doesn't want him as he is now, worn out and beaten. She tells him she wants him to rest and recover.