This is good question, can someone explain this to me as well.
If your target has a lot of armor, there are only 3 ways to kill them:
1.) use weapons that bypass armor
2.) kill the armor and then kill the hp
3.) score a head hit which causes a critical which harms hp if i understand it correctly?
Because i have always been unable to do much with crossbows on orc warriors. Like every 10th bolt would do something other than remove 1/20th of the armor.