Part of what Faulkner want to accomplish in his story is break down memory as logical and linear. You'll notice the narrator skips around thoughout the story so that we as readers are often confused concerning the chronology of events. Beginning with end is part of this process. After all, when we remember something, we seldom recall where the event began but rather where it ended--its result--or perhaps with that aspect of the event that had the most effect on us. When people arrive at Emily's funeral they talk of her "as if she had been a contemporary of theirs, ...confusing time with its mathematical progression, as the old do, to whom all the past is not a diminishing road but, instead, a huge meadow which no winter ever quite touches...." In this passage the narrator throws light on why he confuses the chronology of time in telling the story.