Rather than cancelling all classes today, I'm going to have the two of you cover the younger years (pre-OWL). The students should be able to tell you what we've been working on, but don't feel that you need to duplicate whatever lesson I would have given; just use the time productively. Do try not to send anyone to the Hospital Wing, please.
I don't have your schedules to hand; if your own lessons would be an obstacle, see if you can find a substitute -- someone responsible, good at Defence, and possessed of the common sense they were born with.
I don't have your schedules to hand; if your own lessons would be an obstacle, see if you can find a substitute -- someone responsible, good at Defence, and possessed of the common sense they were born with.