Oscar thought about the noise in the vents He said " It is probably just wear and tear. That is what happens to machines when they begin to break down. I am sure there is nothing to be worried about. The maintance workers are probably working on a solution"  This is one of the rare times that Oscar socializes with his own classmates. He is usually on his own, drawing sketches of old world tech or chatting with maintance workers and scientists about the inner workings of things. It is not that Oscar dislike any of his classmates. It is just more interesting to learn than talking about , to him at least, trivial and unnessasary banter. Oscar just feels that most people do not share his passion. Besides his grandfather
 
After awhile , the sound of gunshots were heard. Oscar seemed puzzled. If it was training, why are they using their precious ammunition? The girl, whose name is Kate or so Oscar remembers, commened on what they were doing. Oscar replied " I do not know. What ever it is, it may be good."  This is unheard to Oscar. Normally there would notices about training drills. Also there is no infestation last time Oscar checked. The next likely logical guess for him is one he does not to be a reality.