I was thinking about this very question, especially as it relates to Leland's possession by Bob. I don't know if they thought this issue through or to what degree when they came up with this, or are making it up as they go. Suppose that Leland invited in Bob as he said, and was possessed, then it is...

Something occurred to me that I found interesting. In season 2, Windom Earle describes the Black Lodge to Leo and his hoodlum victim: "For there is another place, its opposite. A place of almost unimaginable power, chock full of dark forces and vicious secrets. No prayers dare enter this fright...