soo.... every time David and future Syd are talking and she has to go she looks nervous, like someone is watching or giving her permission to be there. Short before she has to leave we hear that "scratching sound like the one that mysterious figure made after Melanie consumed the vape. In the series we are giving to think that that´s the shadow king, I think, but in the future the shadow king is death. In this episode we find out that there are two versions of it, could it be that one survived (prob. lenny) and has different plans and is manipulating the situation in some way.
What do you guys think about this theory or am i just mixing that wierd sickness with the shadow king
