As Jenny realised this point, she changed direction, didn't return to the underground city directly. Instead, she went towards the nearby forest, luring that master watching her into that direction.
As for William, he knew she was going to find a way to get out of Sara's mother's grasp for now. He said too much to make her believe he was someone from the outer world, and that was something to use against Sara's mother.
"She is really adamant at getting me killed," William was about to return to the city when he spotted three cloaked figures appearing from far away. They didn't give him the vibe of being at the very pinnacle of power in this world, and that meant they were indeed from this world.
"She was fast to hire assassins, it's indeed true that cockroaches know where other cockroaches live," he scoffed, placing Sara carefully on the ground, "it's time to release all this on you. Come, let me vent out some steam with you."