He became verbally abusive while I was trying to secure him with chains to the metal hook in the floor and I pistol whipped his head with the butt of my rifle. When he fell, his woolen cap came off his head. I stared at the growth for some time, wondering if I had caused it, but my angle of attack was much to steep. I think the rats have knawed most of it off by now though, so it may no longer be a problem for you.