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Shiori always suppresses her gamer brain, but whenever she stops and says "I need to think" during a gaming session, you know that's when a part of her gamer brain is forcing itself back on, almost like a car engine.
The more layers of gamer brain she activates, the better she gets at execution and absorbing new game knowledge. However, when she is several layers deep into gamer brain, that's also when her nerves kick-in. Shiori is generally uncomfortable with her adrenaline, so she will quickly start to fatigue even as her gamer skill excels. However, the longer Shiori can force herself to stay in deep gamer mode, the better her stamina in this state gradually becomes.