Seventy Percent of the Earth's Surface

Treading water, Greg could see Sarah gathering their belongings. She wasn't fond of the water, so his last swim was solo.
Shadows began to grow along the near-empty beach.
Playfully, he kicked at the seaweed licking at his toes; he loved the ocean, and Sarah would need to change her attitude if she wanted a commitment.
He stared at the horizon, as the setting sun set the water ablaze; the seaweed suddenly felt thicker.
The first tug startled him; the second, pulled him under.
Before the water turned crimson, he gazed upon the jagged-toothed horror that ensnared him.