He doesn't really KNOW it was a ghost ya know, could have just been some crazy supernatural shit, lovecraft carried a gun and this story was highly reminiscent of an HP Lovecraft short story. Well written, freaky. I dunno what to tell you honestly man, that shit is really weird and though I *have* seen people group trip (omg i'm touching the air bubbles! omg, me too!) it's usually not really detailed like that and people need coaxing or whatever to see the same things. Weird man, weird. You should go back and burn that motherfucking damned house to the ground.
P.S. Screw all you little girls who are so afraid of bringing an 'oooooooh, gun!'. Anyone who has spent any time in the wilderness/forest knows that it's always best to bring a gun just in case.
"The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown."
--H. P. LOVECRAFT