Key idea
Compare a forward-corner side sacrifice with a rear sacrifice.
For right , leads toward Uke’s right front corner. Tori extends the left leg diagonally out and falls onto the left side while the hands guide Uke over Tori’s left shoulder. Mirror on the left. There is no sole pressing into the abdomen as in : the forward-corner pull and side sacrifice produce the rotation. Keep the shoulder rolling path open and never use the head as a pivot.