In Fahrenheit 451, the reason why Beatty provoked Montag during their confrontation outside Montag's house was to get him to burn his house down.
This refers to the fiction story that is set in dystopian times that outlaws books and any book found is burnt.
Hence. we can see that Captain Beatty finds some books that Montag is hiding and when Montag resists, they get into an altercation and outside the house, it escalates to the extent that he makes Montag to burn his house down.
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