If, after you sit-up and have transitioned from de la riva to koala guard, your opponent attempts to posture and attack a leg drag, drop back, pummel your legs inside and reset your guard. Another option is to make a grip over your own leg with your wrapping arm/hand and return to the dive under setup shown in Part 1. After the dive under, Braulio shows how to use x hooks to kick your opponent away and dump them for the sweep. He also demonstrates how to attack and finish a similar sweep if your legs aren't long enough to reach their far leg and make hooks.

Links to other Parts: Part 1, Part 3, Part 4