If it comes down to that extent, the authorities may think of handing a show-cause letter. And, the concerned teacher will have to show reasons through official declaration. That’s it. That’s no big deal.
As I’ve told you there exists no such leave rule that allows a teacher to leave school early. There also does not prevail any G.O. that enables any education authority (like ADIs) to issue ‘verbal order’.
Remember one thing, emergency may arise any moment in one’s life. Who knows it may happen to your H.M. some day?