When Escovar's son repeats what the mayor says, it is shown that it's not just Escovar who is against the mayor; the mayor also has ill feelings against Escovar. The mayor either knows he can't, or chooses not to, deal with Escovar's lack of cooperation with the mayor's tooth, and Escovar's profession. It also shows insight to what the conflict between Escovar and the mayor is; the mayor is corrupt and Escovar is a mere dentist that can't say anything against him, which infuriates Escovar.
Quote #5 analysis
A single, but powerful line. This sets the last piece of the puzzle to what has Escovar so angry at the Mayor. This shows that because of the mayor, if it was directly him or just caused by him, twenty men of the town died. Unknown to the reader why or how, it is implied that the twenty men's deaths could have been avoided and stopped; yet the mayor didn't try stopping them.
Quote #6 Analysis
The mayor states that the town and him are the same thing, which further proves his corruption. It also implies that the mayor is stealing money from the town which is known by the rest of the town, but nothing can do anything about it. This adds more tension because is shows that the conflict isn't just between the mayor and Escovar but also conflict between the town and the mayor. Escovar's character is a representation as the people of the town, which changes the out look of the story's beginning