creepy Fifield contortion

One of the creepier small incidents in the movie, which I couldn't quite get a clear view of, is the way Fifield was sitting at the hanger entrance before he went on his murderous rampage. He seemed to be folded up, front legs contorted over his shoulders. Reminded me of Linda Blair's spider walk that was famously cut from the Exorcist. I thought this was scarier than his rampage that followed