(ABC)

Steve Kerr was not happy when the Cleveland Cavaliers started to make a run in the second half of Game 1 of the NBA Finals, destroying a dry-erase board during a timeout.

The Warriors had outplayed the Cavaliers for most of the night, building a 14-point lead. But the Cavs cut into the lead in the third quarter, eventually taking a one-point lead.

Shortly before his team's lead completely evaporated, Kerr went off on his play-design board, destroying it with one punch.

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