Making 10 for 15 shots including 5 of 6 from beyond the arc, Herro finished with 29 points as the Heat notched their fifth win in six games in the preseason.
Butler scored 25 on 7 of 14 shooting in 25 minutes of action for the Heat, who dominated the fourth quarter 34-19.
Jayson Tatum had 23 points for Boston, while Romeo Langford scored 18.
Jimmy Butler scores 25 points in 25 minutes.
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