Class of 9 and 10 year olds, about to go into lockdown, the class is talking about what it will be like and asking questions. Suddenly the teacher says out of the blue, first time anything like this has happened "and who will miss Charlie and his bad temper?"
Charlie is shocked and upset and the class sort of murmured "me" and Charlie's mother asks the teacher what was up when she saw her and the teacher said that she had spoken to Charlie and all was fine, apparently Charlie had lost his temper because someone had pushed him in the playground.
Then the next day Charlie comes out in floods of tears, saying that he had written down an instruction he thought had to be written down, the teacher had starting berating him and saying only he would do that, and encouraged the whole class to mock him, he had become upset at the berating and some of the class had laughed.
The teacher is normally fine.