STC - You make the call!!!

[KWH]

Score tied 7-7, 0:01 remaining in the 3rd quarter, clock is stopped, 3rd and goal on the B-5 yard line.
Quarterback A1 throws forward pass that is intercepted 5 yards deep in the endzone by B1.
B1 returns the ball 105 yards and crosses A's goal line.
During B1's return, substitute B12 runs onto the field (at the 50 yard line) while wearing an "Amber eye sheild" and runs directly to the Umpire and shouts in the Umpires face, "You dumb f**k, you can't take this one away from us can you!"
The Umpire "guestimates" that B1 was on approximatly the A-25 yard line when B12 entered the field.
While the officials are discussing the penalties and enforcment A1 approaches the officials huddle and polietly informs the officials that, he knows B12, his real name is Gainesta38, and he is the same player that the officials disqaulified in the first half for fighting, however he has apparently changed his jersey number from 38 to 12. (The allegation made by A1 regarding B12/B38 is proven to be true.)
What penalties have occured and how are they enforced under 2005 NFHS rules?

[Edited by KWH on Mar 2nd, 2005 at 12:39 PM]