In Lily and Jacob's case, the ability is completely passive, works constantly and is uncontrollable. The twins can always sense the other's presence and emotions, and each would know if his or her sibling were hurt or in danger. This therefore allows them both to have a rough knowledge of where their twin is and experience the emotions the other is currently feeling. The bond is strongest when they are near each other, which also allows them to be stronger in physical strength and in the use of their abilities. It means that they always feel the same emotions, and that one would feel the other's pain, and even die if the other were to die. It is impossible for someone to mimic the ability without having his or her own twin to share it with. This empathic connection may also explain why Lil