My guess is that it probably wasn't caused by a fight at all. I personally think there's a very good chance it was caused by a weighted spear laid by a poacher. - The Elepant museum in the KNP has a couple of examples of these things on display. It's a bloody great spear head weighted with a large rock and hung up in a tree. As Mr Big Ears walks under it, a tripwire is set off and the weighted spear falls and penetrates the skull or spine.