I know that on a 1st-and-10 situation, L sets the clip on the chain (or, if lucky, has someone on the chain crew do it) so that the chains can be re-positioned if moved or during a measurement.
However, the mechanics also state that the chain should be clipped on a 1st-and-Goal situation. Why would this need to be done when there won't be any chance for a measurement, and the chains are set down anyways?
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