You know as much as I would like to think that yelling and screaming while the defence is on the field makes a difference to the offence , i find it impossible to believe it does anything to throw the offence . It does nothing more than pump up the defence.
24 ,000 screaming fans doesn't make a dent. Nor does 100,000 at a collage bowl .Somehow the offence still hears the audibles and the cadence. A little tougher with 100,000 but still not that difficult.