@neo_child no, you seem to have forgotten how it works. It was an active armor (as in the mage had to input mana to activate the feature), but what it did was literally nullify all and any momentum, similarly to how the poison pendants doesn't care if it is poison, regular food or sexual fluids.
It did that by some mumbo-jumbo about removing all kinetic force and placing it on stuff in the nearby environment instead.