Okay so observation… I saw this flash in the promo but I was curious about it so I paused on it. There are two people in the background and it looks like it’s Lydia and Scott. This might be way off or kind of impossible, but I’m thinking that they got into Stiles mind somehow because they have the strongest emotional connection with him, and this might be either how they figure it out or how that save him. Like they’ll talk to theoretical Stiles in his mind while he’s being possessed by the nogitsune. Again, no clue if that sounds crazy, just throwing it out there.