First, they took the island, second they killed Moorwens with fire. Then, they hunted down those creatures they missed. Next, they removed and buried all the dead beasts. After that, as a part of his pay, he recived a place for his family to live. Three weeks later, he left on a journey. Sobsequently, he know one of the Moorwens had survived. Afterward, this surviving beast killed his family and everyone: Finally: the outlander was sad because he followed his orders without thinking.
You always have another option.