I'm a taxidermist and I had a guy bring me a buck that dropped an antler while hanging on his game pole at camp. It had both antlers when he hung it and the one fell off while hanging. Then I had a guy bring me one the other day that when it fell, the antler came off but not a shed. There was a knob left on the skull at the pedicle and a hollow out up in the antler. Never saw anything like it and no explanation. Being a taxidermist, I get to see some amazing things with deer that prove how tough an animal they are.