They say that one only sees him for brief moments before he disappears into a cloud of sand, but those are just rumors, right? Also, he has no need for all that ammo on his belt besides intimidation, as you can clearly see neither a rifle nor a shotgun to fire them. But if he can only be seen in the desert, then how would he be able to survive without food or water for long periods of time? Well, the most logical answer is that either you're hallucinating, or you've just encountered a ghost.