take his gun away, the laugh, then get him/her medical assistance.
Not realy folks. Getting the person help i dont think would be a problem every cell phone in the class is bound to come out as soon as it happens jamming up 911 lines in the process. To stop the bleeding would have to be the first thing i believe. Knew a guy who shot himself throught the foot because he didnt want to go to school that day once. I still laugh about that one though.