"Somebody threw that at us?": Possible Bigfoot throws branch at van's side mirrorlike a "javelin"

These events took place over two consecutive weekends. My husband and I like to escape the summer heat of the valley (Phoenix) as much as possible, and our usual means of escape is up to the Mogollon Rim in Coconino County. We have been going there for years, and we know most of it like the backs of our hands, including all the sounds and wildlife in the area. We generally stay away from the populated lake areas and travel further into the deep woods where there are fewer people. In fact, some weekends we may not see anyone at all, but most of the time maybe at most a couple of other campers riding ATVs or something. Two weekends ago we were at a fairly remote campsite. We were pretty closed in by the trees. It wasn't a large open space like many campsites there. It had been raining on and off most of the day, and we spent the day reading and napping. I was sitting in the front seat of our conversion van reading while hubby was back on the bed napping. I started hearing what sounded like an animal ripping bark from a tree and moving around in the dense growth. This went on for about 15 to 20 minutes. I was so sure there was an elk or other large animal nearby that I sat my book aside, grabbed my camera and waited. It was absolutely silent (besides a few snores from the back of the van) that I was hoping whatever it was out there would break the clearing and I'd get a great photo. After about ten minutes of silence and no other movement I went back to my book, figuring whatever it was had smelled us and moved on. Not five minutes after I had put my camera down and resumed reading a branch about 4 feet long and 3 to 4 inches round came shooting out of the trees directly at the van like a javelin. It hit the side mirror dead on center, pushing it in towards the van. (It is hard to even move this mirror by hand. The force it took to force it in towards the van had to be tremendous). The force was such that it shattered the side mirror into many pieces. There's still a dent on the back metal portion of the mirror from the impact. I had glanced up just a second or two before impact, whether it was from noticing movement in front of me or just glancing up by chance, I don't know. I saw the trajectory, and it was NOT a limb FALLING from a tree. It came straight at us, like I said before like a javelin being hurled at us. I jumped over the front seat into the back and [my husband] woke up immediately. He saw what happened while I was babbling away like an idiot. His first words were, "Somebody threw that at us? Who was it?" We listened and watched for a while but didn't hear anything else. A while later I did think I heard movement in the forest, but by that time my senses were so alert I wasn't sure of what I was hearing. via (Link: bfro.net)