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What are synonyms for the word “mechanical”?

Read the excerpt from "amigo brothers.” felix and antonio turned and faced each other squarely in a fighting pose. felix wasted no time. he came in fast, head low, half hunched toward his right shoulder, and lashed out with a straight left. he missed a right cross as antonio slipped the punch and crossed and countered with one-two-three lefts that snapped felix’s head back, sending a mild shock coursing through him. if felix had any small doubt about their friendship affecting their fight, it was being neatly dispelled.

Write a short summary that includes the major claims and reasons of johnson's argument.