Refer back to the Kyle Klein "OB" play at MVP two years ago.
Had Kyle called a provisional at the DZ throw and when the card arrived at the island they found the disc to be OB, then there would have been no second/alternate throw.
Alternatively, had he called a provisional on the DZ throw and he holes out for a 3 on the provisional. When they reached the island and see his lie is IB, the DZ throw would be discarded because the correct play is from the IB disc and his score would be whatever he did to finish out the hole from the correct lie.
Had Kyle called a provisional at the DZ throw and when the card arrived at the island they found the disc to be OB, then there would have been no second/alternate throw.
Alternatively, had he called a provisional on the DZ throw and he holes out for a 3 on the provisional. When they reached the island and see his lie is IB, the DZ throw would be discarded because the correct play is from the IB disc and his score would be whatever he did to finish out the hole from the correct lie.