The glaive can be used to disarm enemies, although the developer has deliberately made this difficult (after all, where would the challenge be if you could just disarm every aggressor?). But get it right and the spinning metal will wrench the weapon from your foe's hand, leaving them as helpless as... a man who's about to get sliced in half by a Frisbee-sized throwing star. Hehehe.
Depending on where you hit them, you can slice their head clean off their body (which then rolls around on the floor for a bit), or cut right through their torso and cleave them in half. We cut three enemies into said segments and made a small pile of half-people. Very tidy.