A perfect line

As Judy paused, something about the location struck her as wrong. She turned her head, scanning the surroundings carefully. Recognition chilled her. To the left stood her own porch, visible only a few hundred feet away. She blinked in disbelief. Somehow, Bruno had raced almost perfectly back toward their home. Yet they had started nearly a mile and a half down the beach. How had he chosen this exact spot? What was he trying so desperately to find?
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