He managed to kill 5 people without getting any return fire?
About noon, some of the party were back in the shack and others were out hunting, and as the hunting group headed back to the shack they saw that this guy had come back again and sitting in one of their tree stands. They walked over to confront him, and that's when he opened fire.
One of the hunters had a walkie-talkie and radioed back to the shack that he'd been shot, and the rest came running out to help and apparently were ambushed.