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Read some of the discussions here, and honestly, I regret signing up for this game with such a small online community.
Anyway, I doubt Gumer is a Noxian, although who knows, maybe Zubr just wanted to show how peaceful and clue-seeking he is, understanding that they probably wouldn't punish Gumer for something like that, but nevertheless.
The fact that he's defending himself weakly... well, that's typical of the Mafia. Remember how many times Nebo was punished with that kind of reasoning. So, I wouldn't risk it, especially since we're in such a mess. The Mafia will definitely want to eliminate each other now.