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The boy is now assuming the officer would "make up" a reason to arrest him.

Of course he is. What do you think was intended by the statement, "You better stop runnin your mouth or the other officer will find a reason to lock you up tonight"? No reasonable person could draw any other conclusion than that the officers were going to make up a reason to arrest him.

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Read the transcript carefully. "Find a reason to lock you up" simply means, the boy is overstepping the bounds of acceptable conduct and could be taken down to the station if he got out of hand. Is that intimidation, yes. Is that illegally arresting someone? of course not. The officer is letting the suspect know that he has the discretionary authority to bring someone down to the station if they are not cooperative. This kid was resisting authority. Not in a violent way, or even in an arrestable way, but in a way that conveyed to the officer that the subject did not fully respect his authority.
Notice that when the boy warned of the taping, the officer immediately replied "we are too".