refusing to apologize. And again, purely an impression, but the head doesn’t seem like the sort of person to make her apologize. So it doesn’t seem like a quantum leap of detective intuition to suspect that it was the teacher who held out for the "compromise" of a quid-pro-quo apology.
So it is important that you observe that the rest of what I say is not "judgmental" either. I simply say "if it was as bad as in your first account, how could the boy NOT walk out? It sounded as if there would be no end to the distress she was inflicting on him."