the school seem to be very lax like that Just to clarify the two chlidren are mates The woman was shouting about my son getting hers in to trouble because i think they can get a litlle naughty together In saying my son has never had anything but good feedback from the school The woman also took a friend into the class with her I no I'm being a bit extreme but it could easily has escalated to a physical assault I think ?
I think you are well within your rights to demand some answers from the school, in particular to why an non staff-member was allowed access to the classroom, to castigate your child. I do think however you are making an unfair leap, to suggest that it 'could easily have escalated to physical assault'. That's unfair, I think.
Saying that, if she SCARED your child, then she did clearly go too far, and the school should take some action to ensure it cannot happen again.