Threshold (2019)

A man wakes up in the middle of a desert, not knowing how he got there. He starts walking, looking for a way to get out of that place. While he wanders in places he doesn't recognize, we see a woman that is following him from a distance. Caught by anxiety he starts running through the desert, when he stumbles in the sand. Tired and discouraged he lies down and closes his eyes. The woman get close and touches him on the shoulder. He suddenly wakes up on a bench feeling relieved that it was just a bad dream. He stands up and feels something in the pocket of his jacket. He puts his hand inside to discover that it's full of red sand, like the one that was all around him in the desert when he thought he was dreaming. Dazed by that sudden discovery he turns and sees the same woman we saw before, standing right behind and staring at him.