Yes, -1 is the threshold for blue, 0 for grey, and +1 for red. Also due to a little bug not all skill givers have the same weight when it comes to skill, so I may give you a positive that brings you up to +5, then another guy can give you a negative that drops you down 6 to -1.
We weren't worried about that because we figured over time there'd be enough skill going around that most people would not be near the zero mark for long.
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