Act as a seasoned screenwriter with expertise in psychological thrillers. Craft a gripping opening scene for a thriller where [MAIN CHARACTER], a [PROFESSION] with a [SECRET PAST], realizes they are being hunted by an unknown adversary. The scene should take place in [LOCATION], using the setting to amplify tension (e.g., a stormy night, an abandoned warehouse, or a crowded city where the hunter could be anyone). Focus on sensory details—sounds, shadows, and the protagonist’s internal monologue—to build dread. The hunter’s presence should be felt but not fully revealed, leaving the audience questioning whether the threat is real or a manifestation of the protagonist’s paranoia. End the scene on a cliffhanger that forces [MAIN CHARACTER] to make a desperate choice.