it was about half and half. or maybe heat fans are just louder and more obnoxious, which would correlate with front running
...or more accurately, LeBron fans...back when he was at the Cavaliers there were all sorts of people at the Phone Booth in LeBron Cavs jerseys, mostly teenagers and younger, who probably couldn't have named another then-current player at the Cavs.
What may also have helped in the win was that the Heat may have been looking past the Wizards...to tonight when they play the Knicks. Bad teams can collect 'looking-past' wins of that sort from time to time.