A couple of minutes after I took this and wandered off to look at something or other, I came back. The scene was much the same except there was an older woman on the other side of the bench and a space next to her. It could be the woman there at the back who had moved over.
I walked around and to my surprise, the woman was not on her phone. She was deep in thought. Disturbed, I sat down and hastily pulled my phone out of my pocket.