I think, Rosencrantz, it’s probably not good etiquette to mention the king’s death to the king, even philosophically. No one’s particularly keen to be reminded he is going to die, but especially kings and (you can’t know this) but especially kings who have committed regicide. So you’re reminding him, Rosencrantz, of not only his OWN death but the death of the previous king, his brother.
It’s just not good form.