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Shotgun blast to the head, or decapitation. We all know that destroying the brain or severing the spinal coloumn is the only way to deal with a Z. I would inform the members in my team of the bite, and get them to kill me right then. Time and time again someone waits hoping that they can stop the virus/whatever only to become a zombie and a danger to their team or close loved ones. If possible, i would give them all my gear, no point in wasting it, then get shot/decapitated. If it was a swarm situation, shoot myself. Morbid, but realistic.