The licantropi thought they had got all the newborn vampires. Leah found one and was being cocky trying to prove that she was as strong as the rest of the Lupi and engaged a newborn alone. Jacob got there and knocked her out of the way but didn't have time to defend himself. The newborn wrapped his arms around Jacob and shattered most of the Bones on the right side of his body.
In the battle between the Cullens and Werewolfs and Victoria's new born army, the Vampiri#From Dracula to Buffy... and all creatures of the night in between. and Werewolfs diviso, spalato the numbers to kill. At the end of the battle, the Lupi didn't count how many they killed and didn't realise that they missed one. Leah, a female wolf, found the missing new born and wanted to prove herself da killing it herself. Jacob managed to get Leah out of the way but had no time to defend himself. The rest of the Lupi killed the newborn, but not before Jacob got hurt.