I have been taught to also sky flags which are fouls at the snap but are live-ball such as illegal formation, illegal motion, USC, sideline warnings to be sure that both sides see that something did happen because just dropping it at your feet can be seen by one sideline but not by the other if the field has any crown. I will throw flags toward the foul against a defensive player just like an offensive player just as Bob M. suggests because that helps later show better who committed the foul and about when it happened so it is easier to review on film.
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