He shot them because they were using a battering ram on his door .He shot them because they were zombies .He was dreaming that he shot the neighbors at his door .The Neighbors on the other side of the door all had guns as well .
Why did the narrator shoot his friends and Neighbors ?
They came . Scratching at the door , my friends and neighbours . I looked them in the eye just so I could know that they were n't there anymore . I shot them . I shot them dead , again , my friends and neighbours .