The Russia article never explained how they concluded the bear killed the hunter when he walked up to skin it.
Unless they had it on video, it's all a guess. Dead men don't tell their death tales.
The grizzly maze risk was like free climbing mountain cliffs. They all eventually fall off and die. Do what Treadwell did for a long enough period of time, and a bad-*** brown bear will cross your path. Can't whoop a brown bear without a deadly weapon. All Treadwell had were bear treats. His body, and that of his girlfriend.