Sure enough, Duncan has not left yet.
This primitive beast universe has the same animal distributions as the modern world: there are more kangaroos than thylacines in the Australian continent. As alpha of the kangaroo tribe with a great population, of course, Duncan knows more about humans and females than Kruger — more than ten couples are living together in the kangaroo tribe.
Therefore, when Bai Lu told him she was new to this world, Duncan knew there gonna be some issues coming up for her, such as adapting to the different weather and food, and some mental disorders might also show up. If the female doesn't obtain good treatment when she is having trouble adapting to the new environment, things might become worse and even cause illness, or what's worst, death.
This tragedy happened to Ryan's mate once two years ago.