They are not meant to be complete instructional descriptions.
Stances are generally high, and steps natural.
R-arm retracts to side. L ook right and do mirror image of LH movements. Now facing the rear, swing the arm up in uchi uke and kick R mae geri . Step forward twice in front stance, blocking shuto uke. L ook back over R-shoulder, pivot on rear foot and move in opposite direction, blocking shuto uke in front stance.