That conversation was all over the place. Don't know if the Japanese dialogue was that weak or if it's the translation dropping the ball, but it makes those shocked faces fall kinda flat.
Seriously, you can't acknowledge that death is a legitimate risk of trying for the succession and only the strongest one will survive, then in the next minute pretend an attempt on your daughter's life is a death sentence.
Plus what I hoped would be cleared : why the fuck is there even a succession dispute when he is still standing there, living and seemingly perfectly healthy ?
Also, having Isabella standing there behind snow, not allowed to sit or eat, is pretty weird.