What-!? [the moment Sophie hears that noise, she turns and tries to push the curtain open] Oh, confound it! Curtain, open this instant!

[she tries it again--and even commands it several more times--but her efforts are to no avail. however, when she hears the sound of the wall moving, she quickly spins back to look at that]

Well. [she scowls] It seems the only way we can go is forward. Shall we? [she starts out into that darkness, certain that Fuu will follow]