The idea is great and works good. It's just so difficult to find the poisoner. Perhaps it would be easier, if there was a really really small indication. Like the guy moving his arm for one or two frames when poisoning someone.
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The trouble with that is then it would be too easy. It is really supposed to be difficult, and you DEFINITELY aren't supposed to get it on the first try. A small indication might be a good idea if I could make it small enough, which would be hard. All in all, good idea in theory, probably would not work in practice.