Spirit on the river

The River Ribble in Lancashire holds a great deal of history. Once upon a time a Roman fort stood here called Bremetenacum.  Today the river is popular with tourists and anglers.

We occasionally here of spirit photography, a phenomenon in which a ghost is said to be captured by a camera. I noticed one such image in a far distant (and rather noisy/blurred) image that had a silhouetted angler in the centre of the frame and a strange transparent figure to his right.

Seconds after this image was taken the figure (ringed in blue) had vanished without trace.

A trick of the light perhaps or did the fisherman have the company of a ghostly presence, from long ago?

You decide.