From Rom Gilbert's Video Page: All persons in the team area are subject to the rules (1-1-6). Since the illegal action here took place when the ball was dead, sideline interference does not apply. (9-1-5-a, 9-1-6) Persons in the team area can be charged with personal fouls and with unsportsmanlike conduct.
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Elvis, Thank you, thank you very much. (He found this from 2009 Play Situations #3)
10. Ball carrier A32 is driven out of bounds and into the Team B team area at the B-45. As A32 is trying to return to the field of play a person in business attire pushes him to the ground or obviously taunts him. RULING: Team B is charged with either a dead-ball personal foul or a foul for unsportsmanlike conduct. In either case the penalty is 15 yards from the succeeding spot.
All persons in the team area are subject to the rules, whether or not they have an official capacity with the team. (1-1-6-a, 9-1-2 Penalty, 9-2-1 Penalty)