"It'd still freak me out though. Who does stuff like that without being a nutjob? I'd feel the same hesitation before reporting it, I'm glad this guy did."
No question he was a nutjob. He was acting very strange. I spotted it immediately. It was clear that he had a purpose in being there and it wasn't to buy coffee or books. He was keeping the spray bottle close to his leg and pumping it without raising his arm so as not to attract attention. After he left the Barnes & Nobles he loitered near the entrance (in the rain) for a couple minutes at least and then left.
BTW, why don't you give us a description ?
What exactly did he look like ?