Benjamin did not even notice that the man had never left the store and instead decided to stay to prove his worth. The man was already engulfed in the book that he had been reading before customers even started to come around. He didn't really notice anything going on around him when he was reading anyway. He used books as his way to stop himself from constantly worrying about things going terribly wrong and everyone in this bookstore at the moment being killed by some unknown monster roaming around. The only things that could actually get him to stop reading was when there was a customer close to him and he could feel their presence or when he could feel the presence of another being that was not welcome. The presence of unwelcomed beings gave off quite a stronger aura than normal humans, considering the beings were usually magically summoned by something. He could easily just keep tabs on everything he needed without having to worry about it, but it still made the man worry even more about things. Everything could easily go wrong at any moment, with someone simply discovering that magic exists or Benjamin not stepping into action quick enough leaving someone to get attacked by some beast. These were the things that made Benjamin go on edge and when he continued to think about them, he would just be in a worse mood to his customers than he already was. 

The owner took notice of the girl coming up ready to buy a book. He sat his book down and went about the usual of checking the back for the price and telling her how much it costs before plugging the price into the cash register. As he did so, he saw the man behind that should have left a while ago. The store owner glared at the man before looking back down at the register and accepting the cast of the lady and handing back the change. As soon as the customer was gone, Benjamin stood from his chair, "What are you still doing here? I told you I'm not interested in hiring."