It would depend on the state's overtime rules.
If we're going by the ones listed in the rule book then we have a rule change to account for.
In the OT procedures listed, 10-4-3 is modified to say that PSK enforcement is not applicable under this procedure.
Therefore under 2-33-1-a, we have a loose ball play.
Basic spot is the Previous spot.
A foul by B beyond the basic spot is enforced from the basic spot under the All-but-one principle.
A 4th and Goal from the B15
Also a good case play to point out why enforcing from 'where it hurts most' is incorrect. That line of thinking would have us enforcing half the distance from the B10.