New IP Rule (3.7.1)

[ljudge]

How are we to enforce the following rule change to 3.7.1 that was previously a non-player foul? The following was taken directly from the Fed site for convenience...

In Rule 3, the substitution rule was changed to make the entry of a substitute during the down a foul for illegal participation rather than illegal substitution. Rule 3-7 was amended to require all players, replaced players and substitutes to leave the field on the side of their team box, and that replaced players or substitutes go directly to their team box. Rule 9-6 was amended to classify the entry of a player, replaced player or substitute as illegal participation if such happens during the down, and to clearly state the penalty for illegal participation.

OK, my question is as follows. HOW do we administer the penalty?

Sample case play:

A's ball 1st and 10 at the B25. A only has 10 players on the field. Immediately after the ball is snapped an A player runs on to the field at the 50 and runs toward the play but does not participate in the play. The QB throws a pass and it's caught for a touchdown.

OLD RULING: TD Counts. Administer the non-player foul on from the succeeding spot (the try) which is the 3-yard line. So the try will be administered from the 8.

NEW RULING: It's IP with the new rule. I know the TD will not stand because it's now enforced as a player foul. But where do we administer the foul from? It was A's ball on the B25. Remember A runs out of he team box at the 50. Is it 2nd down from A's own 35? Enforced from the previous spot? What?

My assumption: It's A's ball 1st and 50 from the A35. This is strictly a guess. I'm curious as to whether this was discussed on another thread, or if not what you guys think it should be.