What is the most exciting part to read in the cold equations

The most exciting and yet the saddest part of the story comes when the end is near for the stowaway.  The pilot of the spaceship shuttle is able to reach the authorities who refuse to make an exception to inevitable death for the stowaway. However, she finally gets to speak to her brother whom she was planning to see and explain her position on why she did what she did.  Her realization that death is inevitable for her comes when she is forced to become an adult in a very brief period of time to face her fears and her consequences. Then the hatch opens and she is gone . . .