I have seen extra horns in unusually places on antelope. I seen antelope with double horns. I would not think it is from an injury or the skull would be injured in that place. I don't see sign of injury. Thanks for posting interesting.
Haired out Mtn Goat makes one of the coolest mounts. There heads are so different. WTG, I have never got one, high on my list, just got to draw the tag.