Rivera was talking to people about his pre-game meeting with a family who lost a son when Chamberlain, in a loud voice, was trying to get somebody's attention behind the dugout.
Rivera asked Chamberlain to lower his voice. Chamberlain replied several times "Don't shush me."
Rivera explained to Chamberlain he wasn't telling him to be quiet but to lower his voice.
Asked by a NYT reporter about the incident, Joba replied that it was between him and Mo.
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