Years back I found a huge aluminum arrow, a 2419, with a ball of dry deer hair on the end and one plastic vane missing. Under the dry ball of deer hair was a half bloody mop of deer hair, under that was an original Thunderhead. I could see no blood in the area but the illegal permanent stand, public land, was obviously the source of its flight. About three hundred yards down a deer trail through some prairie weeds on the edge of the public land, I found a doe shot through the lungs with the missing vane stuck in the fur at the entrance hole. No blood. I do not know why the broadhead grabbed so much hair on the entrance, I use serrated Hills and that has never happened to me, but I do know that a broadhead coated with hair will not cut much and will not leave any blood trail, although it did blow through both lungs and eventually kill the deer.