Possible rock throwing at Batnuni Lake witnessed in British Columbia, Canada

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Our family had gone camping to our favorite lake again for about the 4th time that summer, and the weather was clear and great. After a long day fishing and boating, I put our 2 year old to bed in our motorhome at about 8 pm. We had a roaring fire going. Just before 10 pm my husband went into the motor home to put our 5 year old to bed. She wanted him to lay down with her until she went to sleep, so our 2 dogs and I stayed outside and enjoyed the peace and quiet and the warmth of the fire while waiting for my husband to come back out and join us. Our dogs were laying at my feet by the fire when our Rottweiler started to growl and bark at the lake. I had my back to the lake and told the dogs (by this time our pug was giving it her best shot at barking and growling too) to can it so they wouldn't wake the kids. I honestly thought the dogs were just being silly.Then all of a sudden a HUGE splash was made in the lake which scared the dogs into another round of barking and me to say "...