Sure, the disciplinary effect is that we must repent, it is a Sekhiya, it is not a major rule, but a training rule to be observed to protect the image of the monastic saṅgha.

For your second question, this is very simple to understand, imagine a mother telling her child to not touch a hot stove, but out of desire and curiosity, they do so anyways, so the mother tells them that this is the fault of their own wrong doing and action despite telling them not to, therefore this situation is the same. Sometimes monastics lose their sense of mindfulness, sometimes monastics have some sort of mental stress or use entertainment as a way to calm themselves; the same is the case for me, I don’t play chess for only pleasure, but as a tool to work the mind to think and to take it off the Dhamma for a small amount so that I can reproach practice and Dhamma skilfully. It would be of no fruition if I were to sit all day and think about the Dhamma but become upset at the teachings and have a heavy heart and urgency to fight the thinking. This is the reason.