It did expose their weakness, but it wasn't their defense.
Their weakness is that they tend to take their foot off the gas pedal too often and get too comfortable, they stoop to the level of the competition rather than force the competition to play up to theirs, that issue has been frequent throughout the season, but it hasn't really burned them until now.
They just didn't come to play.
They practically beat themselves.
They thought this would be an easy game to win because they were playing the Lakers, so they were not into it at all, and look what happened.
They're still the best team in the league and they're still the favorites to win the title, but not if they play like this with this mindset and attitude.
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