A football fan knows the meaning of the red flag. A head coach throws it when he wants the referee to review the last play (hoping the ref will change his mind). I noticed that all coaches have these moments of hesitation before they throw it. I have learned they hesitate because they first ask assistant coaches way up in the booth to review the play. If after review, they see a chance for a successful challenge, they tell the head coach. It is this moment of reflection that can change a football game.
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