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Spinner having a crisis, not even able to speak or understaning what people are saying. But he still remembers who he is fighting for, for who's sake. His leader, his friend, the person who played video games with him even with a different appearence. That's who he remembers and fights for, a friend.
What i'm saying is, Spinner didn't flashback to when Shigaraki was destroying everything or when he was powerful as a leader, no. Spinner specificly flashback to when they talked about video games together, he prefers to remember back then when AFO wasn't around, when Twice was, when they were all peaceful and together. That's why he's fighting. For a friend, not a leader.