Shin on shin  guard

Left Shin is touching opponents right shin on near leg  , right hand blocking  left leg (far)

Attackers right leg goes further between opponents legs as lying down  and right arm under hooks far (left) leg. Transferring weight off shin/foot to lift opponent whilst rotating underneath keeping leg trapped between left arm and left hook.

Arm transitions from under hook to wrap the thigh of the shin leg into a rolling single leg until on top.