gonna go on a limb off the fact that the black knight was alive so soon, i'm expecting this to be some sort of weird time loop where the girl he met was actually him way in the future after living long enough to have forgotten most of his life as a human. also thinking that the fog actually was him being transported to that world and by dying within it he was forced into the cycle. then again i could be completely wrong and hes just possessing her somehow, but i find that unlikely considering she seemed very experienced when we first see her but when he comes too shes new to the team.