Play 1: 3rd and 10 from the A6. A12, from his own endzone, throws the ball, which is intercepted in the endzone by helmetless lineman B65.
Since the ball is 'dead' when B65 gains possession, it's not a touchdown for B. But where is the penalty enforced? Was this a loose ball play, because in 'nobody' caught the ball? Is this penalty enforced from the end of the run before the pass was thrown?
Is the next down 1st and 10 from the A21? Or 4th and 1 from the A15?
What if the penalty is declined? Is it 4th and 10 from the A6? Or is it a touchdown for B?