Braulio shows what to do if you attack with the sickle sweep from spider guard and your opponent defends in a way that his free leg is too far from your reach to finish with the double leg. In this situation, your opponent's base will be compromised in a way that will make him vulnerable to a low single leg attack.
Links to other Parts:
Part 1,
Part 2,
Part 3,
Part 4,
Part 5