Exactly why leave it a week? Maybe had to practise them "threatening stares" into her phone first before dealing with it.
Like you say kids can twist things too. They should be thankful they weren't at school in the late 90s. We had a science teacher who use to throw chalk and blackboard dusters at us if we were chatting and not paying attention. Always just thankful he was a s aim
sure my parents would've went in had he ever managed to hit me however if I told them it was "well you should be paying attention in class"