Yea, I'm still trying to wrap my mind around the relation of Orthiskin to Dermal Plating to Dermal Sheathing, and how to interpret some of the special rules regarding Dermal Plating to Dermal Sheathing (and Orthoskin to a lesser degree), and the inconsistent use of the word armor, esp. with regards to Dermal Plating, see about about "Natural Armor, Like a Trolls", while troll 'armor' is neither ballistic nor impact.