There was never any indication that a shot was fired at Chai Vang and that he was acting in self defence. I've no doubt there were epithets, he'd been thrown off the same piece of private land the year before. And for whatever reason, tresspassed again. Also had skipped a court date for tresspassing in Green County.
Again, that might not be the case (and another freeper mentioned that he supposedly shot the hunters in their backs), but that is what the article reported as his statement.
And if you didn't read the pings to you on this and the other thread, some of the Vang threads in your link are about the mass killing Vang, not the killed Vang (there are two).