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>> “If Seattle would have run on first down, and they didnt score, they would either have only one more play they could run (because the clock doesnt stop), or pass the ball in a situation where it was expected and they were trapped in a run-favored personnel grouping.” <<
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You are absolutely correct!
The flaw in the scenario is that the Seattle receiver was so caught up in his personal glory that he forgot the main objective, of protecting the ball from interception, at such a critical moment.
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Seattle didn’t know that Malcolm Butler had a vision.