FROZEN: Surrounded

Seeing as though I wasn't going to be able get any answers in the cave, I decided to chase the "caveman". Once I left the cave, though, I saw that the caveman wasn't as alone as I thought he was. I was hoping to corner him and try to make contact, if that was even possible. But now I had to come up with a new strategy. Standing at the mouth of the cave, I was surrounded by at least a dozen cavemen. And all of them held clubs in their hands. It felt like I was in one of those "Planet of the Apes" movies or something like them. Was this the future of the human race? What could have caused everyone to become cavemen?