Man recalls encounter he had as a teenager near Kalkaska witnessed in Kalkaska County, Michigan

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I am writing this for my neighbor Bill (not his real name). I interviewed Bill on December 25, 2010, and for additional details two times again. Bill said that when he was a teenager he went with a group of 11 relatives and neighbors from Detroit camping in the upper Lower Peninsula of Michigan. They camped west of Twin Lakes in northern Kalkaska County. The group was made up of several men, about 7 boys (ages 7 to 12 years), and Bill. They arrived on a Friday morning and set up camp about 50 ft from the road and in a spot where no one else had camped. They cleared away the underbrush and built two rings of rocks for their campfires. The two rock rings were about 30 ft apart. It was early Spring because Bill recalled there were still patches of snow on the ground under the trees during this trip. In the early evening, they roasted marshmallows and hotdogs 'the children sitting around one campfire and the adults around the other. From behind where Bill was sitting, a rock was thro...