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Arthur realized he hadn't unblocked the video . He had unblocked the room .

It started with a glitch in the script—a single, misplaced character that looked like a Greek letter but acted like a digital lock: .  Unblock This Channel

A video feed flickered to life. It was a first-person view of a hallway. Arthur’s heart stopped. He recognized the carpet. The scuff marks on the baseboard. The flickering fluorescent light overhead. It was the hallway of his own office building. Arthur realized he hadn't unblocked the video

He didn't turn around. He couldn't. He just watched the screen as the figure reached out a hand toward the "Arthur" on the monitor. A video feed flickered to life

Panicked, Arthur looked at his office door. It was closed. He looked back at the screen. The hand on the video reached for the doorknob.