I met a guy once that did night fishing. He had a string of locking hooks that he would put his catch on then put them back in the water. The string of locking hooks prevented the fish from getting away but they stayed alive because they were in the water they normally lived in. attached to one end of the string that was supposed to be attached to shore or boat, he had a waterproof light. It was just a ball that gave a glow and lit up where his fish were. The ball usually floated but he told me if he had a big enough fish on there and the string got detached from it's anchor point, the fish could possibly drag the light under.
I had never seen a light like this before but I don't fish much. Maybe someone upstream had a fish on a line like this and it was a big fish. I can imagine the fish dragging this ball around until the battery eventually dies. if the fish stayed close to the bottom the string may not have been long enough to allow it to surface.
As far as the lights on the road are concerned, I think you may have been so freaked out by the idea of what you think you saw in the river that you became delusional and your eyes began to play tricks on you.
I had never seen a light like this before but I don't fish much. Maybe someone upstream had a fish on a line like this and it was a big fish. I can imagine the fish dragging this ball around until the battery eventually dies. if the fish stayed close to the bottom the string may not have been long enough to allow it to surface.
As far as the lights on the road are concerned, I think you may have been so freaked out by the idea of what you think you saw in the river that you became delusional and your eyes began to play tricks on you.