"Are you so sure about Lucius and Narcissa, Severus? You told the boy yourself that his father couldn’t be away from his mother, though your explanation was the curse, was it not? That is neither here nor there. I don’t believe that is the case with Mr. Malfoy and Ms. Granger, Severus, that this is a simple soul bond as you are implying. Are you not curious why their bond manifests so uniquely? The magic contained within the pairing is incredible. So incredible, in fact, I’m willing to wager there is a third component."