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Why would it be a big problem that Kusto's face turned red? Because in the Akuri tribe, red is extensively used as a base color only during combat or revenge.
This meant that if Gao Yang was not mistaken, then Kusto who had his face painted red was out for revenge, or perhaps to wage war against another tribe.
After Gao Yang explained why the appearance of red was a serious issue, Catherine hesitated for a moment before whispering, "The Akuri tribe isn't the type to habitually engage in battle, could we have been mistaken, or could the red on his face simply be part of a pattern rather than a base color?"
Martin immediately shook his head and said, "From such a distance, if it were only a pattern of red stripes, it wouldn't be visible, and what I'm seeing right now is indeed red."