Final answer:
Chief Bromden's first words since coming to the institution are a significant plot point in 'One Flew Over the Cuckoo's Nest.' McMurphy responds to him with encouragement and excitement, which reinforces their bond and signals a change in the story's direction.
Step-by-step explanation:
The question pertains to the novel One Flew Over the Cuckoo's Nest by Ken Kesey, which features the character Chief Bromden. Bromden's first words since coming to the institution are a revelation, as he has feigned muteness up until that point. Unfortunately, there are no direct quotes provided in the content snippets shared, so I cannot supply Bromden's exact first words or McMurphy's response.
In the novel, McMurphy's reaction to Bromden's first spoken words is one of encouragement and excitement, as he realizes that Bromden has been pretending to be deaf and to protect himself. This moment is significant because it represents a deepening of the bond between McMurphy and Bromden and a turning point in the narrative arc. McMurphy's response helps to empower Bromden and sets the stage for further acts of rebellion against the oppressive environment of the institution.