The boy ends up running back to his Mum & Dad after asking Nim to come with him. Nim says no because it is her island and her home.
Hayz started crying because Nim was all alone and couldn't find her Dad (who, at this point of the movie, was lost at sea).
We've always known LGR has a massive heart and is full of empathy. Now I've seen it in Hayz as well :-)