My bad. I mis-read my own case. A LBI via a HC. The foul is possession at the A-10. I then applied the 15, but in the wrong direction!
So then, it's B 1D/G @ A-1, n'est pas?
If A doesn't accept the other LBI, yes.
I'm not sure that the 1st LBI awards possession to A, and negates the yardage within LBI that A committed.
It's not the LBI that's awarding possession, but the offsetting penalty application that's negating any changes of possession.
Therefore, since the changes are negated, A cannot get new downs yet must retain the ball.
So all that's left is the UR's point of application.
The PBD is ignored, as it's in the endzone as a result of an illegal play, same with PBH. All that's left is PLS. Back 15 from PLS - is my logic.
PS: D'ya think the Americans reading this are wondering if we've lost our marbles?