Library Mystery

I am right now at the local library, sitting at a four seat table in the main reading room with two other blokes who work on their lap tops. One of them just packed up his rucksack and left the room. The thing that surprises me is that he left his lap-top on the table, right across from me. The thing that scares me is that I fully expect this to be a bomb-plot, and catch myself trying to remember any distinct characteristics about the guy that could prove my point. I don't remember any weird tattoos that I can connect with any known dissident group, so right now I am just going to stay where I am and see what happens.