I will answer, but I am not sure what you mean by "protocol."
No one on the bench can act in an unsportsmanlike manner just because they are on the bench. It is not necessary to look at the bench if it is obvious that something was said. Sometimes if a person has been running their mouths more than once and it is obvious who is talking.
And if a key contributor wants to stay in the game, then he probably should be quite while sitting on the bench.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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