Go to the Principal/Administrator and complain about the teacher intimidating the child. Relay this incident and any previous incidents in as much detail as possible. This is unacceptable and they have to do what it takes to fix the problem - it could be teacher re-training, moving teacher to a different class or whatever else the school policy recommends. It is not OK for a child to be intimidated and be stressed in a safe environment which is what a school should be.
My son was being bullied and punished by a vindictive teacher because he pointed out how she was teaching a wrong math concept to the whole class and set out to disprove her (the whole class laughed, he was given a timeout, asked to write an apology letter for being "disruptive" though he was polite and put up his hand to take permission before talking. this teacher used to punish him frequently for no wrong doing according to my son, dock points because his writing assignments were not "meeting her expectations", not allow him to go to the bathroom except during recess time etc etc - he was 6, had nightmares as a result and was anxious about school). I set up an appointment with the Principal and told him to handle the problem and to ensure that my child was not being bullied by the teacher who should have been a trusted adult. I also told him how my DS who is an exceptional rule follower and a people pleaser is being accused of wrong doings and punished even when he says he did nothing wrong. The Principal had been told by the teacher that my son was a trouble maker. I explained the whole sequence of events to him and the vindictiveness that followed for weeks and asked the Principal to check with other teachers interacting with my DS if he was a trouble maker or not. It turned out that his other teachers backed me up. I heard nothing back for a while, the teacher did not bother my son after that, the teacher announced that she was leaving her job soon after, we quit that school a short while after that.
