Mila calls Robert's situation as Robert's "untimely death" because Robert doesn't mean to die yet, based on the original plot. Robert meant to die once after Tope became the crown prince.
In addition, Robert has made significant contributions to how Christopher will become a terrifying tyrant in the future. Robert was drowned with vengeance after the deaths of both of his masters. He ended up making Tope drown with hatred with him.
Mila became anxious about the sudden change and wondered if maybe having "awareness" had brought death toward Robert faster. That is why Mila and the strange being not only shared information about what they know about the truth of the world but also tackled how they could still leave peacefully without harming the original plot and without dying.