Preciesly the reason I dont teach anymore, the majority of todays high school kids are a HUGE pain in the ass.
Odds are the little shit didnt have to go to the bathroom he just wanted to get up and roam, which seems to be the current past-time at alot of high schools.
Had I been that teacher I'd have let him get up and walk out after I told him not to and then Id have flunked him for the 9 weeks.