Braulio reminds his students that the helicopter armbar from De La Riva Guard only works when your opponent gives you the appropriate response when you attack the balloon sweep. He mentions how the sweep can be used to setup the armbar and the armbar can be used to setup a sweep. He also shows how to back roll and still finish the armbar when your opponent bases out with their hands on the ground and attempts to cartwheel as a counter to your initial attack.
Link to other Parts:
Part 1