C1349 Primarily Revenge
This arrangement was for the sake of better taking care of the two siblings. One could recuperate from injuries, and the other would be safe.
He couldn't let Ms Mao go back because he didn't have his protection. If Larrea came back and he hurt Ms Mao again, he might not be able to make it in time.
Moreover, that Garson would also think of ways to find Ms Mao, wanting to learn something from her