NFHS

A 3/7 on B20. A10 throws a legal forward pass that is intercepted by B42 on the B2. In an attempt to avoid A, B42 loops back through his end zone. While in the end zone, A69 momentarily grabs B42's face mask. B42 then fumbles the ball out of the end zone and it crosses the sideline at the B5.

Result? Clock? Penalties/enforcement?

When B intercepted this turned into a running play. The basic spot is the spot where the related run ends for a foul which occurs during a running play. Because the enforcement spot for any foul by the defense (A is now the defense) is the goal line when the run ends in the end zone, we march off 5 yards from the goal line and give B 1/10 @ B-5 clock on the snap . If for whatever reason B wants to decline, result is the same

I agree with Mr. Neil.