"... I was actually invited to stay for a bit after class and talk, but I made a mistake. My professor asked me if I had a class to go to, and I told him that I

"... I was actually invited to stay for a bit after class and talk, but I made a mistake. My professor asked me if I had a class to go to, and I told him that I did but I could skip it. He told me I shouldn't skip my classes, so THEN I had to leave. ..." Unfortunate. Next time stand your ground. You might not get another chance to meet someone like McCarthy.