A Fleeting Glimpse
Determined to find something tangible, they examined their footage meticulously. There, caught in a brief flash across the lens, was a glimpse of something that defied the natural flow of the river. It was a splash, too forceful to be a fish leaping or a branch falling.
This fleeting glimpse could be the clue they needed, a physical presence in the water that connected the strange occurrences. It was a slender thread, but one they were eager to follow.