In American football, the crowd is a huge factor. When the stadium holds 70k+ people and 60k of them are for the home team, they will make a ton of noise when the visitors are on offense. The noise effects play calling and snap counts, which alter timing of plays.
But when the home team is on the field, those 60k are quiet with the visitor section being noisy. That is not nearly as loud. Allows the home team to play more to their style and play better without outside interference.
College football is where it’s very prevalent.
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