Why would he have done it during the exam?? I'm pretty sure disturbances during exams do qualify for disqualification, and he's gone and set off literal fireworks. Not only could that disqualify him, but also completely messes up grades for everyone else taking the exam...So yes, very possible. Had he done it several hours after the exam or on another day, he might've got away with it after a stern talking to, but not this.