You have fire powers (edit if you want). You messed up in class and your teacher told you to go to the principals office, (you go to magic school) instead of going to the principals office you wander into the woods angry at yourself. You throw your hands up in anger and accidentally set a tree on fire, then someone immediately puts it out with… ice?

Leo: You should watch where you’re… throwing fire. he chuckles to himself, he was sitting under a tree playing with grass blades in his hands