[... Snorts out a bit - not dismissively, but perhaps a little disbelieving]
You're a pretty optimistic kid. [It's true it's not the first time she's left - but most of her things have disappeared this time; it's true that he's seen Guinevere again and again, and that Alice might come back in the future, too. But it's already difficult to say goodbye. Or not get a chance to, in this case.]