When John and Kevin are riding the subway train John intentionally "gets the attention" of a very hostile commuter. In the shot prior to John pulling the face at him it is clear that the commuter is not paying attention to him at all, hence my assumption that John is the one starting the conflict. He then goes on to influence the commuter to commit a crime(s).
Is this a simple case of John influencing others around him to sin just for fun or is there more to it? What exactly is the meaning behind this scene other than showing John's power to influence/manipulate? He talks about delegating just before the conversation starts, so is any part of his conversation with Kevin prior relevant here?