just imagine the damage an overcharged claw could do to armor, and since pegasi technically have control over the weather anywhere they wish, they could create a sustained mini-lightning cloud on the blade gauntlets to overcharge the gauntlet's blades to the extreme, making night guards exceptionally lethal when they so wish.
the downside (cuz we cant have an OP guard, right?) to overcharge is a faint buzzing sound, which gets louder the more the gauntlet is charged up.
-being badass -quick, lethal strikes -attacking an enemy from more than one direction with lethal results(if you prefer using two gauntlets, compared to one) -possibly cleaving a sword or spear in three/five -be more aerodynamic than your friend, who is lugging a spear and shield or something -flip somepony off with one blade -dive bomb your enemies and slice them to meaty ribbons
I didn't mean to Imply that Destiny was the only one to have that mechanic. It was just at the time, Destiny's Release was near. (Either that, or I had played the Beta.) Because of that, It was at the forefront of my thoughts, rather than other examples.