If this wasn't posted, I found this elsewhere:
It's actually not even an interpretation, the rule is very cut and dry. Even if the flag was thrown for removing the helmet, the foul would not have been enforced and the game would be over because the game is never extended to enforce a live ball treated as a dead ball. Here are the two rules that cover this situation:
Rule 9-2-1:
There shall be no unsportsmanlike conduct or any act
that interferes with orderly game administration on the part of players,
substitutes, coaches, authorized attendants or any other persons subject to
the rules, before the game, during the game or between periods.
a: Specifically prohibited acts and conduct include:
(f) Removal of a player’s helmet before he is in the team area
(Exceptions: Team, media or injury timeouts; equipment
adjustment; through play; between periods; and during a
measurement for a first down).
Penalty: Dead-ball foul or live-ball foul treated as dead-ball foul.
15 yards [S7 and S27] from the succeeding spot. Flagrant
offenders, if players or substitutes, shall be disqualified
[S47]. If a player or an identified squad member in uniform
commits two unsportsmanlike fouls in the same game, he
shall be disqualified.
Rule 3-2-3:
Extension of Periods
a. A period shall be extended for an untimed down (other than
a try) if during a down in which time expires one or more of the following
occurs (A.R. 3-2-3-I-VIII):
1. A penalty is accepted for a live-ball foul(s) not treated as a dead-ball
foul (Exception: Rule 10-2-5-a). The period is not extended if the
statement of the penalty includes loss of down (A.R. 3-2-3-IX).
It's actually not even an interpretation, the rule is very cut and dry. Even if the flag was thrown for removing the helmet, the foul would not have been enforced and the game would be over because the game is never extended to enforce a live ball treated as a dead ball. Here are the two rules that cover this situation:
Rule 9-2-1:
There shall be no unsportsmanlike conduct or any act
that interferes with orderly game administration on the part of players,
substitutes, coaches, authorized attendants or any other persons subject to
the rules, before the game, during the game or between periods.
a: Specifically prohibited acts and conduct include:
(f) Removal of a player’s helmet before he is in the team area
(Exceptions: Team, media or injury timeouts; equipment
adjustment; through play; between periods; and during a
measurement for a first down).
Penalty: Dead-ball foul or live-ball foul treated as dead-ball foul.
15 yards [S7 and S27] from the succeeding spot. Flagrant
offenders, if players or substitutes, shall be disqualified
[S47]. If a player or an identified squad member in uniform
commits two unsportsmanlike fouls in the same game, he
shall be disqualified.
Rule 3-2-3:
Extension of Periods
a. A period shall be extended for an untimed down (other than
a try) if during a down in which time expires one or more of the following
occurs (A.R. 3-2-3-I-VIII):
1. A penalty is accepted for a live-ball foul(s) not treated as a dead-ball
foul (Exception: Rule 10-2-5-a). The period is not extended if the
statement of the penalty includes loss of down (A.R. 3-2-3-IX).