The Fall of Man is symbolized by the fall of Edmund. the White Witch tempts him with Turkish Delight, but also with power. That power is centered on the notion of revenge, on being shut out by his siblings, specifically Peter, and denied his "rightful" place.
In the same way, Eve was tempted by Satan with the fruit from the Tree of the Knowledge of Good and Evil, but also with power of deciding between what is good and what is evil, which had been denied mankind by God.
In both cases, the fall occurred when the individual felt that he/she was owed something and was offered an easy way to get it. In the case of Edmund, however, he did not know the full consequences of his actions as did Eve, who had been warned by God. Still, he knew his actions were wrong, but decided to do it anyway.
Both Edmund and Even chose sin, but they also chose the consequences. To them, the consequences were worth it, just so long as they got to do what they wanted.