If this happened 30 years ago, the driver would never have to leave the bus. He would have reported the misbehaving kids who would have been banned from the school bus and would have gotten a serious spanking at home.
Thirty years ago I remember the bus drivers carried a two foot long, four inch wide paddle with holes drilled in it for meeting out some sobering instruction.
I only saw it used once, but that was the quietest bus I've ever been on (at least once the wailing had died down).