Agreed about the lateral side. However, any pressure of rolling a leg (in any manner or angle), is highly dangerous. Especially at the knee. It doesn’t matter if he knees bend in that direction in a natural movement. If you have a hold of a leg, roll, and apply maximum pressure, to take a player down, that is well outside the rules. Herbert’ss knee, did not want to be bent, yet Shepard felt the need for it. Hence, making it a dirty, and unnecessary play. 315 lbs of a man rolling a leg, is no joke. Shepard is a 7 year veteran. He knows better.