Read the following context and answer the question.
Context: We ' ve all heard it before , and I ' m sure some of the other 2D 's felt a little bit of pride , but some of the new students got kind of hushed and worried looking . The teacher went about it in a very good way though . Apparently , Kota and I had Ed during his first semester he ever taught . We were n't aware of it then , because he was excellent .
Question: Why are Kota and the speaker surprised that it had been Ed 's first semester ever teaching ?
Answer:


He was a great teacher and they were sure that he had been doing it for some time