Makes me want to know that man's story. I think perhaps he is fishing as I think I can see a fishing rod there but it a little sad too that he is on his own.
He was, indeed, fishing. A lot of people fish here, but this morning was especially cold. I thought this could be a good metaphore for life: many times we are in fact alone and the fog represents the uncertainty about what's to come, since we cannot see past where we stand at a given moment.