I am reading Tin Tin again. He says "il n'y a plus qu' 'a nous separer." Looks like "the only thing to do is separate ourselves." Later Milou says "Il n'y a plus qu'une seule chose 'a faire." "There is only one thing to do." My dictionary gives "il n'y a que" as "we just have to." I think I can understand this usage. My question is why is the word "plus" included in the expression? For emphasis? Thank you.