Creature sighted twice by three men while camping in northern Minn

Three men were on a fishing and camping trip near Lake of the Woods when they saw a tall hairy figure watching them from behind a tree. The figure ran away bipedally, and a rotten stench was noticed in the area. As the men walked along railroad tracks bordered by swamp, a football-sized rock flew past them from the side with no one visible, and they later saw the figure run across the tracks ahead of them. They returned to camp and told local residents, some of whom said they had also seen a hairy person.