That’s because the person who warned the crowd was a time traveler from the future.
Maybe because of the warning some specific person was saved, or many, not just this individual.
Either that or the person warning the crowd was a psychic.
Stranger things have happened.
The warning came from a time traveler eh? I suppose snark is acceptable when one’s only connection to a criminal investigation is a Nancy Drew novel. At any rate I’m certain the answer to who this person was won’t be coming from sheriff Lombardo given he melted into a quivering pool of tears at his last presser.