Shield question..

[Borealis]

I am also unsure if that's a cRPG or Native Multiplayer mechanic but I believe that having a shield on your back adds Shield's body armor + 10 to any projectile that hits the shield on your back.

So, if you have 40 body armor and your shield has 20 body armor and is on your back, if you get shot anywhere in the shield on your back, you'll have 70 body armor to the projectile.