Pro-tip: make sure to stand a bit sideways when fighting anything, if you value your testes. And if you're a guy. Doesnt really matter actually since solar plexus, ovaries, etc should not be presented frontally in a fight.
According to reports, the man is an elephant keeper from a zoo, he was out with some friends on a wild pig hunt and decided to punch the 'roo after it put his dog in a headlock to get it to take off and stay away from the dog and anyone else.
I heard that he had cancer and his friend took him on pig hunt over the summer as a "always wanted to do this before I die" kind of thing. The guy got married last week in the hospital and died two days later.
I think this bozo was pretty shocked that the animal just didn't fall down like a human would. He turned and walked away right after, which was probably smart because the look in Mr. Roo's eyes was pure murder.