When you execute a solid backstep, you will end up with four options to advance your position, all determined by where your right arm (during a right knee cut pass) ends up. If you're hugging around their head, that's the first option we'll look at, although you could also drape your arm over like a Kimura, or allow your arm to end up underneath their arm, like a "Twister pass" or ninja roll position. Finally, you could also re-pummel for the underhook and revisit the knee cut guard pass.

Let's take option one and consider how that might work out. Once you are finishing the backstep motion, guide your right arm so that you are hugging around your partner's head, ensuring that they can't turn their head in toward you. You can reinforce the grip by grabbing the fabric on the far side. Now, walk your hips up so that you can begin to turn your trapped leg's knee toward the ground. This motion will begin to free your foot, allowing you to finish a (very smashy) guard pass.