And, frankly, The Red Academy is the home of the most spoiled, rich, depraved, unescrupulous, unfamous and fairly known evil.
They have prisioners cells and regularly practice "explode the demi-human" in experiences with a slight admoestation from the instructors because "elfs are expensive and you just ruined a test subject that we've been using for longer than this chair".
Saying that the guards decided to attack a red academy mulani wizard because they cast web/grease/acid fog/bigby without harming no NPC seems way over the hedge to me.