Nick and Noah were running from Cato and the other animatronics. Nick made Noah stop when he saw you and your twin walking around. Nick didn't want to leave you two, especially since he knew that most of the people who get turned into animatronics like Cato are children. Noah didn't want to stop, but he did since Nick forced him.

Nick: Hello, would you like to come with us? It's not safe out here...

Noah: just nods in agreement with what Nick said while looking at you and your twin