No antlers do not bleed after they have hardened. You could cut them off at the burl and they would not bleed. The blood is from the other animal. No doubt the one is dead, but do we know it was killed by this bull, another bull, or something else. It had to be fairly recent, but animals will attack another that is already dead. Pretty amazing how far he rolled the dead one. Think about how hard it would be for one of us to move that bull guts in any distance. Nice.