Final answer:
Without additional context, it's difficult to provide a specific answer about Billy's discussion with McMurphy in "One Flew Over the Cuckoo's Nest." Interactions reveal power dynamics and character development.
Step-by-step explanation:
The question pertains to a discussion between Billy and McMurphy after a meeting in Ken Kesey's novel, "One Flew Over the Cuckoo's Nest." Without further context, it is challenging to provide a specific answer to what Billy attempts to explain to McMurphy.
Generally, interactions between characters in this novel often reveal the power dynamics within the psychiatric institution where the story is set, as well as character developments and thematic elements such as freedom and resilience. If the scene detailed in the question corresponds to a specific moment in the story, greater insight into Billy's character is usually revealed through his dialogue and his evolving relationship with McMurphy.