"Certain issues may need to be taken up with the Headmaster, such as if you suspect one of the students has been harmed by another. You'll have to use your integrity and judgment as a Healer for that, I'm afraid. There's no real guideline there. As far as being a Hogwarts staffer; you have the ability to give or take house points but not detentions. When there is an inter-house conflict that results in more than just scrapes and bruises or a few petty jinxes you'll need to send for the Heads of House. The house elves will be of use for those errands, just call Whimsy, she's especially dedicated to the hospital wing. You've read Hogwarts: A History?"