Equipped with the scroll, that they bought from Denlor and that will allow them to shrink Elrohas-turned-statue down to more a managable size, the adventurers head back out towards the ancient library, in order to rescue their elvish ally. They only grant themselves a short break in the settlement, hoping that no new threats would find their way into the library proper in the meantime.
And indeed, they manage to reach the place without an incident and also find that Elrohas is still standing in the scribe's hall where they had left him.
Kordunn uses the scroll and once the spell is completed, the statue shrinks down to one-sixteenth of its original size. Only a few inches tall and appropriately light-weight now, carrying Elrohas back to New Phlan is the easiest part of the endeavor.
About an hour later, the party is back in the civilized parts of Phlan, heading towards the Temple of Tyr, where Elrohas petrified form can be brought back to life.
One of the priests asks them to leave the statue in the temple, the bishop will take care of the matter on the next morning.