I have a somewhat biased view, since I thought the first and third riddles were no-brainers, especially the last. (I might have died on the second and never had a chance to make it to the third, however; except for the line about "freezing at danger," I'd probably have guessed the second riddle as "a heart" or "passion," rather than "blood." Have you noticed how pertinent to the situation the three answers are?) But I do agree with you, they're very much tied up with her view of the world. If you can't think as she thinks, you haven't a prayer—and very few of suitors, one senses, have ever been interested in doing that. They're fascinated by the externals, the beauty and the unattainability. The woman beyond the ice-mask? Eh, whatever . . . So Calàf is different not only in that he can answer the riddles, but for the reasons that he can: he sees something else.