Kind of spoilers but not really at all:
Why does everyone refer to the last guy as Marauder Shields. The enemy type is a Marauder and like all enemies his health bar shows whether he's protected by Armor/Shields/Barrier.
You don't see people calling Phantoms - Phantom Barriers. Atlas Armor. Banshee Shields.
I don't know why this annoys me so much, but it drives me crazy.