Answer:
After the group of twins arrived, he was taken back to reality from his flashback of his childhood memories. They were too disturbing to even make it possible for him to be thinking about his childhood memories.
He became angry with Linda for she mistook him for Pope and did not seem to remember her own son.
In his frustration, John had shaken his mother to try to make her remember him. But this only led to her choking and stopped breathing. While he was trying to get the nurse, she had passed away.
Explanation:
In Aldous Huxley's "Brave New World", the dystopian world that is depicted in this story shows a world where emotions and individuality are not part of humanity. It is a scientific world where everything evolves around the theme of "everybody belonging to everybody".
In Chapter 14 of the text, John had gone to meet his mother Linda who was in the hospital. He remembered how in his younger days, she had "stooped over his childhood in Malpais, remembering (and he closed his eyes) her voice, her movements, all the events of their life together". He remembered how they had done their learning lessons. But all came to a stop when "shrill voices made him open his eyes", indicating the "interminable stream of identical eight-year-old male twins pouring into the room".
Trying to recapture the moment/ spell of his childhood, he tried to resume the "A, B, C, vitamin D" but that didn't work. She mistook him for Pope which angered John and banished all good memories of his childhood. In his attempt to try to bring his mother back to reality, trying to make her recognize him, he shook her so hard in his anger.
Linda did recognize him but before she could speak or say anything, she begins to choke and finds it hard to breathe. By the time John came back with the nurse, Linda had already passed away.
