Rose was devastated, she had a mental breakdown the moment she heard the news about Ari's death from Xarex.
"And you did nothing to stop it?!" Rose screamed to his face, but the young man looked unfazed. He didn't show any emotion whatsoever.
"What can I do? That's beyond my authority."
"Rei didn't do anything too!" Rose was hysteric and there was no amount of reasoning that she could accept. She was beyond hurt.
Even if she rushed back to the Holy Kingdom, there was nothing much she could do, since it would be too late for her, because it would take her two days and by the time she was there, there would be nothing left of Ari.
That forest was so vicious, even without the monster, there were so many wild animals that would love an extra meat for their meal.