So wouldn’t a human Spock (with biologically human nature, but the nurture that Spock carries from his life experience being raised as a Vulcan) actually be super rational and logical?
I reasoned that whatever tools Spock employed failed for one of two reasons:
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Vulcan responses to emotion are extreme: surprise isn't just surprise it's abject terror, happiness isn't just happiness but absolute mf hype, disappointment is more like a spiral of depression. Since human response to emotion is much more measured by comparison, he'd need time to recalibrate... time he didn't have.
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The procedure that removed his hybrid nature removed whatever moderation was done to him. As a normal human he may not even have a katra anymore, so it's possible that whatever physiological changes that take place after kolinar aren't there because not all of the physiology is there.