From April's Referee Magazine...

[Warrenkicker]

But in the Case Book ruling the foul was not an illegal forward pass.

8.5.2 SITUATION D: Fourth and 15 for A from its own 8-yard line. A1 is in punt formation and receives the snap in his end zone, but fumbles the ball. A1 quickly recovers and throws a forward pass to ineligible A2, who is also in the end zone. A2 muffs the ball and it falls incomplete. RULING: If B accepts the penalty for A2's illegal touching, it results in a safety. If B declines the penalty for the foul by A2, the result is B's ball first and goal from A's 8-yard line. (5-1-3c; 7-5-13 Pen; 8-5-2c; 10-5-6)

It was illegal touching. So this was a legal pass and the spot of enforcement is not the end of the run. It was ruled illegal touching and even though that would be a spot foul it can be declined without a safety being awarded.

8-5-2c was the basic point of my arguement against the example above.

8-5-2c. A player on offense commits any foul for which the penalty is accepted and enforcement is from a spot in his end zone; or throws an illegal forward pass from his end zone and the penalty is declined in a situation which leaves him in possession at the spot of the illegal pass and with the ball having been forced into the end zone by the passing team.