I tend to just use the sideline warning for keeping the kids back. On USC, if it's blatant enough I'll simply call it - but for borderline USC, I'll almost always give the coach a warning (even if it's not him that said it - like the situation you describe). The coach is held personally responsible for the conduct of his sideline - so I don't really care who said what - it's all on the coach.
That said - if something's bad enough for an immediate USC, I usually know who said it, and will issue it directly to him.
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I was thinking of the immortal words of Socrates, who said, 'I drank what?'”
West Houston Mike
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