Thursday contains one numbered scene, No.33, in two parts: Wendy and Danny playing in the snow, followed by a zoom toward Jack inside The Colorado Lounge. It condenses the family dynamic developed across A Month Later and Tuesday.
A Month Later begins with Wendy bringing prepared food to wake Jack. Over breakfast, he chooses writing over going outside with her. The chapter then shows Jack failing to write in The Colorado Lounge while Wendy and Danny explore the Hedge Maze.
Tuesday shows Wendy preparing food, Danny exploring the second-floor hallway, and Jack writing alone. Wendy tries to engage him in conversation and he verbally attacks her.
Thursday reduces that pattern to Wendy and Danny keeping each other company outside while Jack remains alone in The Colorado Lounge, not working. The isolation is a choice he has repeatedly enforced, and the scene makes his altered state conspicuous.