Fisherman hears possible howl, knocks and has object thrown near him in the Medina River Natural Area witnessed in Bexar County, Texas

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This occurred after work. I stopped by the park on my way home to try out some new camping equipment. There are two entrances to the park; the main entrance off of Hwy 16 and the one I like because it's more wooded off of Applewhite Rd. Some new trails are being made because of some flooding that occurred in the area last year so there are some trees that have been cut down. One of these trails has a wooden fence with a "No Trespassing" sign on it. I ignored the sign and made my way to the river. I made a small fire and began fishing. While I was fishing I started to hear loud banging. I turned around to see if i could see what was making the noise but saw no one. We do have Woodpeckers but this was no woodpecker. I thought nothing of it and continued fishing. A few minutes went by and I heard a loud moan. Like a wail. Again, I turned to look around and saw no one. I started thinking, "Okay, someone has got to be messing with me." I kept on fishing when out of the corner of my eye some...