Ah. That kind of harm.

Yes, as a preventive or disciplinary measure, certainly. Your note to Mrs Malfoy makes the intent of the rule quite plain.

Your earlier statement about the activities and ... adventures the children are like to have suggested your junior counselors might be required to cast the spell upon the student in order to save him in impending peril. You can imagine my confusion, particularly as we are in the throes of preparation for our journey.