Kayakers describe rock throwing near island on Keystone Lake witnessed in Tulsa County, Oklahoma

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Last night my friend, his girlfriend, and I went kayaking around Keystone Lake, in Oklahoma. The lake levels have been about 15 ft above normal, and we decided to go kayaking and camping. There is a penninsula that is open during the day to people to use four wheelers and dirt bikes on, but since the water has been so high for about a month it has been inaccessable to them due to the path going out there, is under water. We got out there about 8:00 p.m. and kayaked the mile or so to a nice sandy beach, and set up the tent and started a fire. We cooked hot dogs and fished a bit but caught nothing. Midnight rolled around and my friends girlfriend had to be at work early the next morning so he was going to escort her back to her car. Just as they were getting their gear together, we heard some grunting and repeating howling noise with the same tone pattern about five times. I am an Eagle Scout and a seasoned camper in these parts, so hearing this noise frightened me a bit and made me not ...