Question: Ivy says some people have a colour. Do you think Noah had a colour and she knew it was him in the woods? If so, did she intentionally let him die knowing he may have killed the man she loves?
Answer: From what I recall, there's nothing in the movie to indicate that this is the case.
Answer: Don't disagree with the other answer, but Ivy could have sensed it was Noah. While Ivy claimed to "see" someone's color, more likely she recognized people by their individual sounds, smells, movements, etc. which she interpreted as their "color." She knew Noah attacked Lucius and, in his unstable state, might kill her. She knew the "monsters" were fake and no-one else had a motive to harm her. I don't think she intended to let Noah die. She was protecting herself and could do little to save him once he fell into the pit.
raywest ★