英语翻译我只想知道最后一句话是什么意思.The professor was running late.Despite t

英语翻译
我只想知道最后一句话是什么意思.The professor was running late.Despite the delay,he arrived to find that none of his graduate students had deserted him.Instead,they were waiting,pens and notebooks ready as usual.
The professor liked to pace a bit while he lectured,slowly moving from left to right and back again as he explained the intricacies of production and operation management.And so he did on this day,moving quickly into the material to make up for lost time and beginning the slow game of Pong his students had come to expect.
就是“beginning the slow game of Pong his students had come to expect”是什么意思?前面一大段都是给的语境