For once, Nero was wrong. It was not just a long day, but a long few days! That night, when Nero went to bed, he consulted his roommates about what was taught during classes that day. While he missed classes, he could still study from the book.
The issue was that the things that were taught in class weren't all in the book, and all the things in the book weren't necessarily taught in class. Moreover, the professors were likely to elaborate in depth on important topics that might only be casually mentioned in the books.
The problem he faced was that there was no solution to this issue. It wasn't like he could ask his roommates to teach him what he missed in class because they all had their own things to do during their limited free time - not to mention that he might not be able to teach them anyway.
