Imagine if a Cruiser or Carrier came above Noble Six and he was in an area about to be glassed. He activates Armor Lock as the Covenant vessel sends down the glassing beam, and the beam hits the Armor Lock and reflects back up to the vessel, and BOOM! That would be pretty badass! This would never happy of course, but what do you think?
I can just imagine the Covenant’s reaction: “CURSE ARMORLOCK! Bungie, Y U ADD ARMORLOCK TO REACH?” ლ(ಠ益ಠლ