There is an easter egg. Here is how to activate it, when the billboard says "Missing people: 5" Go to the tavern and look for a man in the black robes, he will say "This cave has a lot of potential, sure... Just renember to escape and call it quits at some point." Now the first sentence weirds me out. He says the same things as what the first journal entry said, "THE FOOLS have no idea of power in this! IDIOTS with their "morals"...degrading humanity to a worthless state of no concept of true knowlage. I will have to study on my own, in this cave. It is dark and cold, but dry and empty...I see a lot of potential here." Now I don't know if it is just a man saying that, or you get to see the actual man wrote it.
I think the stage "Pedro was here" Was what he was experiencing when he took those "Pills" And could be capable of his ability to experience Matrix/Bullet Time. Most likely he was unconscious or he killed the scientists who made him take the pills. Just a theory. :)