Target shooter hears strange sounds and finds possible tree-breaks off of the Mountain Loop Highway witnessed in Snohomish County, Washington

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Saturday May 9th my girlfriend I and were returning from an overnight camp off the Mountain Loop Highway. I wanted to find a place to shoot that was off the road and away from any trails, the river, or possible campers. Found a spot that didn't have a car for more than a mile each way. Pulled over and loaded up about 10 magazines. Spent about 15 minutes getting everything ready on the tailgate of my truck. Heard absolutely nothing but birds chirping. I hiked down a ravine to the left of the road about 150 yards and shot off some rounds for about 15 minutes. Finished up and walked back up to the car where my girlfriend had been waiting. As soon as I came out of the ravine and onto the road we both heard a LOUD cracking / snap noise from the top of the wooded hill that was to the right of the road, the opposite side of where I had been shooting. We both looked at each other wondering what it was, our jaws dropped. It wasn't a tree breaking because we didn't hear anything hit the gr...