In the winter wonderland with worse weather than the mountain in the Labyrinth of Vidur had before becoming Zach's property, finding traces of other groups was next to impossible. Still, on the twenty-eighth floor, Mandra picked up residual presences of others.
The traces they found definitely didn't belong to the Children, and were not anywhere close to Zach. They had found traces of the barbarians. Now, they just had to follow them through the blizzard to see if they belonged to Maura's mother or any of the other tribes.
Both Zach and Maura had trouble seeing either of the other tribes making it this far this soon, but then again, they had made it this far in better time than the Maura chief.