After what had happened in Ton Bes, the dragon had decided to follow Daniel and Aeron in their travels. He had spent too long hiding from The Tamer and her army, and the fight that had taken place just the day before, paired with Daniel's speech while in the cave, were the boost of confidence that he needed to go back to being Xargy, the proud and domineering dragon who he had been, when he still was a prince of the indomitable race of the dragons.
The three had decided to leave in the direction of Daniel's world of origin, where the latter had hoped to, once again, reunite with his friends and family.