Braulio shows two methods for countering an opponent who manages to start spinning free of your kneebar. The first is to control their foot and follow them as they roll and finish the kneebar. If they manage to get ahead of you and you are unable to follow them and finish the submission, transition to 50/50 and work the leg drag from there.
Links to other Parts:
Part 1,
Part 2,
Part 3,
Part 4,
Part 5