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Allison's father welcomes a visit from his sister, but scolds her temerity at werewolf hunting. She hit Derek with a special, blue bullet. He managed to hide and comes to high-school to commandeer help from Scott, who makes scared Stiles drive him to the veterinary shelter. Scott must use a dinner date at the Argent home to search it for that bullet type, according to Derek indispensable to save him, the only alternative being amputating his arm.