Some weapons (and other items as I recall) have a stat that negatively affects enemy armor. For example, the Quatermass and the Pit legendary mace has a -470 to all armor per hit stat. But how does this work?
Let's suppose that I find a weapon that has -100 to all armor per hit, and I'm fighting an enemy with 500 total armor. Does each hit act as if the enemy only had 400 armor to begin with? Or does the enemy's armor degrade over time, to the point of being broken (e.g. after five hits with the aforementioned weapon, the enemy's armor is now 0)?