In the normal game, the damage that an NPC causes is solely based upon the strength or rather the "level" of the NPC. And the armor protection of the hero is subtracted from this damage as percentage. This way the hero could reach a maximum protection of 90%. But this holds for an attack by a scavenger as well as for a an attack by a troll, such that the hero, wearing the best armot in the game, still receivesome damage from a scavenger, even when it is just about a few hitpoints.
With activated AB, the damage caused by a human or Orc to the heis not only connected to the strength of the NPC, but also influenceby the damage of the weapon the NPC uses. When someone attackonly with fists, that person is now less dangerous than for example with a battle axe.
On the other hand,the armor of the hero doesn't work percentually anymore, but in absolute figures. If the hero has a good armor, then weak opponents will rarely be able to wound him anymore. To make sure that the hero does not become completely immune against attacks from weak enemies, a small percentage of these attacks will still cause a little damage.
Not changed are the battles between NPCs themselves and the attacks of the hero, nor are the formulae for attacks with ranged weapons or magic.