[His lack of reaction doesn't bother him. It's not like Hans can judge anyone for using someone and discarding them later. It's what he did to Anna, and she only survived because he was about two seconds too slow. ...And something else, probably, but he's not here to think about his past crimes. He's here to learn more about Ferran for..... possible use later, maybe. Yeah.]

Since you can't reverse this, he's just going to continue to worsen until he dies. No counter magic or anything.

[That's pretty bleak, worse than the whole frozen heart business that Elsa accidentally cursed Anna with. Course, it's possible that Ferran himself just doesn't know how to fix this. Would a solution actually come up in this dream world?]

How does the corruption spread through his body? [Guess Hans is just going to ask as many questions as he can until this guardian or whomever gets tired of it.]