The creature was weak compared to the spirit that was hitting it and trying to make it submit so that its soul could be eaten. In Belle's eyes, the land of the dead was to eat or to be eaten. She heard the creature that had planned to eat her cry out in pain as it was beaten by the stronger spirit. It was Belle's first day here and maybe that is why she felt pity for the creature, and if she wasn't wrong after the creature was eaten by the spirit, the next person on the menu would be her which would be devoured by the spirits.
Her face flinched every time she heard the bone crack. Unable to look anymore, she finally broke a couple of sticks in her hand and slid down the tree.