First Precept
From Scholar Victoria
Meyer's dagger section provides a number of precepts; general principles for dagger fighting.
The first precept advises us that when holding the dagger in a revers grip, to parry by thrusting over his arm as he attacks (as we see in Parry from Low Guard 1), this threatens and attack with the blade, deflects his arm, and brings it down so we can attack behind it with the pommel or a thrust/slash. This can be done against thrusts from all angles be they above, below, left, or right.