Starting with a knee cut guard pass, drive your knee all the way to the ground, and then backstep to the opposite side of your partner's body. Be sure that when you step back, you don't simply swing your leg wide, but instead, take a much shorter, tighter step back, and then drive your knee through the space underneath your partner's leg. Assuming you were cutting your right knee across, it is your left knee that is poking through this space.

Hug your partner's knee close to your body, making sure your knee is all the way through, isolating their leg, and finishing with you in the over/under position, attacking their left leg with the inverted heel hook. Lean to your right hip to bend their knee at 90 degrees, and get your heel hook grip (always go palm to palm here, and always use only the blade of your wrist for the finish, ensuring that you are hooking their heel, not sliding off). If your partner rolls through, you have a sort of double whammy: the kneebar during the transition, and then the 50/50 inverted heel hook finish when they roll all the way through past the kneebar.