The snap is instantaneous, so your player either came on before or after it. The official evidently ruled after, and applied 9-6-4:
Quote:
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Originally Posted by 2009 Rule Book
It is illegal participation:
a. When any player, replaced player, substitute, coach, trainer or other attendant
enters and participates during a down.
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Illegal substitution is a 5 yard penalty; illegal participation is 15.