Miami Heat fans are not happy with a controversial clock decision late in Game 6 of the Eastern Conference Finals against the Boston Celtics. With Jimmy Butler and Co. losing because of just a few milliseconds, plenty of the Miami faithful brought the clock issue into focus.

The issue started when Butler was fouled by Al Horford from the 3-point line in the closing seconds of the game. Based on video replays, there were less than three seconds left on the clock when Butler was fouled by Horford. The clock actually stopped at the 2.1-second mark, though the foul and the whistle occurred a bit earlier.

However, it surprised everyone when officials brought back the clock to three seconds. Many argued that it should have been less than that considering that the ball was still in play at the three-second mark prior to the whistle. Heat fans even brought out the receipts to make their point.

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The clock issue, of course, is important because it really made the difference in the Heat's narrow 104-103 defeat. Derrick White was able to make a putback shot before the buzzer sounded to give the Celtics the victory. Nonetheless, had the clock been at less than three seconds, Miami would be preparing for the NBA Finals right now.

It remains to be seen if the NBA will issue an explanation with regards to the Game 6 clock controversy. Regardless, it's unlikely the Heat will take any action given how the league has addressed similar issues in the past.

Not to mention that there's only a short gap between Games 6 and 7.

If the Heat lose the series after leading it 3-0, that decision will be considered the biggest moment of the series.