premise: It was an extraordinary sensation, floating here in the inky darkness, with moonbeams dancing off the top of the small waves, and the twinkling stars above shining through the moth-eaten blanket of the night sky. It was as if she was all alone - a tiny speck on the ocean, surrounded by a galaxy that seemed to stretch out into infinity. Despite being caught up in an almost mystical trance Laura had not entirely forgotten that she wasn't the only person swimming in the ocean.
hypothesis: Laura wasn't the only person swimming in the ocean