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.
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
Arthur realized he hadn't unblocked the video . He had unblocked the room . He didn't turn around
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.  Unblock This Channel