A sideline play is a real good example of where a quick whistle is needed as soon as you see a foot on the sideline.
Like someone pointed out, the runner does not know he is OOB and most likely the potential tackler is not about to let him continue running down-field as he does not hear a whistle.
All bets are off once a runner knows he is OOB (such as when he does it because he wants the clock to stop) as he usually is moving two, three or more steps into the sideline area. Still need a quick whistle, but not much leeway should be given to any late hit now.
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