As soon as the servant told him the news, he announced it to the rest of the family so as to raise their morale. They needed a piece of good news like this to get their lost spirits back.
When the Luther family servants listened to Zach's announcement, color returned to their previously haggard faces. They had been travelling for a long time and couldn't be happier to stay a while in any kind of place. Since they were going to be staying temporarily in a city like Byzantine city; it was akin to the cherry on top of the dessert that they had already received. They couldn't have been happier.