That still doesn't answer the question of what happened, Luc. I think it's left open to interpretation - but if you read the LARGER POSTS in this link... there are several possibilities.
a) it was the WITCH
b) it was the Ghost of the Parr fellow
c) it was Josh - who was either under the spell of the witch or had simply gone insane and intended to exact revenge on his cohorts who led him unwittingly to his death in the woods - there is a long explanation of that on this link.
d) it was Mike working under the spell of the Witch.
e) it was backwoods freaks flucking with them the whole time
PLEASE NOTE: there is also speculation about:
1. The Parr house in the woods, as the story is told, was burnt down. So what was it doing there in the woods? Was the house itself a GHOST? Or...
2. Did they TIME TRAVEL back before 1941 while in the woods, because the Witch owns the woods?
It could be ANY OF THE ABOVE? It could have been the Witch holding the camera as she wanted those who find it to Watch.
I like the idea of it being Josh and there NEVER WAS ANY WITCH at all!!
ALSO NOTE: when Mike is standing at the WALL his FEET/SHOES are FACING BACKWARDS from his body - there is a photo at the link. He COULD have been hanging there, by Josh, who purloined the nylon rope that we see in his 'care package' of teeth and flesh, but we don't KNOW that Josh died...
Read this link and see what you think: http://www.answerbag.com/q_view/446590