It's just that you mentioned blue nails- and Tadashi said it means lack of oxygen. No oxygen means no bloodflow, right? It'd add up.

[...his first thought is absolutely 'Kylo' but he'll try and be nice and think of other explanations, at least? pointing fingers this early every other week usually just made everyone start yelling and punching each other.]

Um... maybe it... stands for something? Belle could've been trying to tell us something without the murderer knowing what it meant.

[like... kill your lelf... okay yeah actually he has no good explanation for those letters. at least Chip said it so he didn't have to]