He'll stand around patiently, waiting for a lull in the Sarenrite priestess's casting so she can eject them from the demiplane and back to the contingent point of the Material. If they land in the wrong place, he has Teleport scrolls to go back.
He - needs to hold Carissa's hand, doesn't he, to make sure they end up in the same place. It's not actually an option from any reasonable standpoint. All right.