The sound of a footstep brought me back, and I sat up just as a guy in running clothes came to a stop 10 feet away. He was joined by a woman, also in running clothes. Both were sweating heavily.

"Did I wake you up?" he said.

"No," I lied, "I was staring at the sky." I turned to look down through the trees at the green water pouring through Devil’s Racecourse Shoals 100 feet below.

"Great sky to look at," he said. He stepped up on a bench and then onto the railing. Leaning against the trunk of a poplar, he stretched his right leg behind him and then his left.

"Want to stretch?" he asked the woman. She shook her head.

In a few moments they were gone, and I was left alone again on a deck built on the granite palisades of the Chattahoochee River National Recreation Area.

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