the more you dig into stuff like this, the more you respect how deliberate this movie actually is. The black eyes aren’t some separate early warning sign before the real changes kick in, they’re literally the visual marker of the exact moment his control slips and instinct takes over.
I think that’s such a smart way to show it instead of just telling us, every time his eyes go black, that’s basically the movie showing you the second he stops being fully himself. Little details like this make me think people are sleeping on how tightly written this film’s mutation arc actually is.