Following the arrival of the British Men of Letters in America, they attacked the pack with weapons the pack had never seen before, presumably the sulphate gas mentioned by Mick Davies. Twenty pack members were killed in the massacre though some survived.
Following the attack, the pack disbanded and the few survivors scattered for their own safety. Driven insane by loneliness due to the loss of his pack, Justin began seeking a mate. After turning Claire Novak, Justin explained to her the loss of his pack and what it had driven him to shortly before being killed by Mick.