What choice did Jacob make? What did he lose? What did he gain?

In order to avoid the danger of searching for a ymbryne in hollowgast infested, war torn England, the group had to rely upon Jacob's talent of sensing these invisible monsters. Seeing Jacob overwhelmed by the responsibility, Emma, a girl who can create fire with her hands, comforted him saying that Jacob was even stronger than his hollowgast-killing grandfather who had the same power as Jacob. While talking outside the cave, the zeppelins found the pair. As the children fled, Wights landed on the beach with dogs.