There was no rain, I was uphill (not my much, but I was), and the bolt definitely hit him in the head. It showed the animation when you get hit in the head lol. That whiplash head jerk animation. The bolt showed clearly in his face. I think he was wearing lordly everything. I think I saw a Gothic Plate and his head armor being a top tier sallet or the armet.
Not sure it should be possible, even with rain, even uphill, even if they have lordly everything, to take a steel bolt from an arbalest to the head at 15 feet away. I mean at that distance, you have to make the shot count when infantry is engaging you, and if a headshot isn't enough, then...