Who is he going to have charged and what will he have them charged with?
What crime has been committed? Can he charge a fifth grader with rape? Was the sex consensual?
Will he charge the teacher that released the students to an empty classroom with negligence?
What crime was committed?
As far as disciplining the teacher, no way, this was an unusual situation, the tracher was trying to do good, (the assembly to discuss the murder), so I would blame the rapists involved. It's not like the teacher was passed out drunk or any thing like that.