Much like the boomerang in the Zelda series, multiple targets can be selected before you throw the glaive. So while you could just throw it straight at an enemy and decapitate him, you could have even more fun and select an electric light first, then aim at him.
The glaive carves through the air, smashing the light and taking on its electrical properties, before finding its target and frying him as well as cutting him up. One enemy we hit stood with his arms out in a T-shape and started convulsing with electricity dancing over his body. Once he had fried from the inside out he fell to the ground in a smoking heap. It's sick, but oh so satisfying.