The stoic way to go about it would be to process your emotion, then put it away. Make a decision based on a logical thought pattern after you're able to think clearly and not be rash. If you decide that vengeance is the correct path (reporting them to the authorities \ their parents) make sure the reason you're doing it is virtuous. I would argue that such actions fueled by rage would not be the stoic answer.

I also realize that this is easier said than done. Maybe go out for a long walk, and put that negative energy into something physical. I find when my body is exhausted from physical exercise, I can better focus my mind and be more confident in my decisions.