Based on the context and the answer, generate a 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 .

Answer:

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



Why are Kota and the speaker surprised that it had been Ed 's first semester ever teaching ?