While it is understandable that you were upset, Miss von Tussle, the reason I called you all to this meeting is thus: the job of a prefect is to provide help and guidance for the other students of your house. When you and Mr. Larkin are in disagreement, Slytherin house is at a disadvantage.

Just as you prefects are there for the guidance of others, your Heads of House are there for your guidance. If you-- or any prefect-- again find yourself in a position where compromise cannot be made, I advise you to seek them out before attempting to solve your problems with projectiles.