This is the Lead's line. The Trail should only signal if the Lead is asking for help. Similar to a ball coming from the Trail being thrown to the endline.
They seem to get this right but it could have been a disaster if both did not agree. That is why the Trail waits for an indication of help.
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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