Whilst backpedaling away from enemy combatants and loosing shafts at them, I’ve seen, at times, a head shot where the enemy promptly drops dead. However on other occasions I’ve seen and enemy with an arrow protruding from their unarmored forehead showing no ill effects, other than an increase in cursing and threats. Sort of like the alien in the beginning of Peter Jackson’s “Bad Taste” blundering around with a sledgehammer embedded in his cranium.
In another situation, an enemy had so many arrows protruding from different body parts (including their head) I felt I was fighting a porcupine.
Rather amusing, but also annoying when a bloke just doesn’t die.