Opponents equips the arrows that hit them. Norms? (The Elder Scrolls 5: Skyrim)

First play on Legendre, in the initial stages of enemies with bows handed out only in the way, but always left the chance to oragenics in case of contact. Somewhere in the middle of the game we started a one-shot phenomenon from them, and in the end it was clear - I began to craft powerful arrows, use them (play for Lucara), and enemies like real Berserkers, pulled out of himself ensnared in them the top of the boom and sent back. Sobstenno, the question in the original game and provided (or not provided, but a bug) or is the work of the mods (is the strength of ten, directly about a bow and arrow too, but not vacancie)? Way of fighting something already found cowering behind a rock, waiting for a death sentence to those beasts armor, run and distribute in the soup, but the reason is interesting.