Anne says teachers are most unpredictable. Is Mr. Keesing unpredictable? How?

According to Anne, Mr. Keesing could be termed as unpredictable. In the beginning, he was very strict and punished Anne by asking her to write essays on topics related to talking. In this way, he tried to play jokes on her in different ways. Each time Mr. Keesing gave Anne the topic for her essay; she smartly presented her arguments and successfully countered his jokes. Eventually, after Anne’s third write up, his attitude towards her changed and he became very lenient. He never punished her after that and even allowed her to talk in the class.