Hartsfield told the BCMA the reason why there was no calculus class, I think it because he knew a student in Coalwood after school just go to the mind or become a football player even what they had studied. It was so disappointing for the student, for BCMA, for even the teacher and also for me about the real thing was happening then. However, it also emphasized the important of the rocket's building, the only way for BCMA to get out of the mine, get out of the dangerous and go to university. And it was the reason why Quentin told that Sonny was the only ticket for them to go to university.
In addition, I could also find that Dorothy was not a good person, she just dated with the one she lied to Sonny, after that she kissed sonny and then dated with Jim, who was Sonny's brother. That detail gave me a different look about Dorothy and also I trusted more about the love Valentine spend for Sonny instead of the love Sonny spend for Dorothy.
The last thing I could figure out was the sonny's collapse, it was like he was the reason for the died of Mr. Bykovsky. It also made me think that Sonny would give up and go to the mine or he could want to become a miner engineer. But both of that things made me felt worried about the future of Sonny and the future of his dad, of the mine, and also of the