Family describes possible rock throwing while fishing in Lake Superior Provincial Park witnessed in Ontario, Canada

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My wife and I along with our one year old son were moving up the side of a creek heading to a deep pool where I have fished in the past. The creek itself is generally about 20 feet wide with thick cedar bush mixed with some poplar stands along the banks of the creek. As we made our way along the bank of the creek we smelled a strong odor which I assumed was a black bear in the area. After about 10 minutes we reached our destination on the creek and I started fishing. My wife sat on the gravel bar about 13 feet behind me. After about five minutes of fishing my wife asked me if I threw a rock by her. I asked her in a strange manner as if I would be throwing a rock when I was busy fishing. She then stated again that she heard a rock land near her on the gravel bar. I thought that it was probably something that fell out of the trees that were hanging somewhat above the area she was sitting at. Just after that she heard some noise in the forest directly behind us and called to me to come a...