Kinds of Restraining Orders | LegalMatch Law Library
I really doubt if this is anything but a man who likes to talk and is looking for someone just to listen. I have had that happen a lot at various places here in the Villages especially. If it is more then I would definitely get the library involved as much as possible. Above is a link to kinds of restraining orders if it comes to that.
If criminal plotting or any kinds of actions are occurring on library property I would certainly inform them about your suspicions. They could be held liable if they knew about it or should have known about it.