[His smile fades a bit but it's still there.]

As stated before, my main concern is mysteries. However, if there was anything that would threaten these humans, I would be willing to protect them.

They are more precious to me than I let on, rest assured. [He's talking about no humans = no mysteries. And he doesn't like that.]

Hopefully that is a good enough reason. If not... then I don't know what else to tell you.