Takeuchi has a reputation for being impulsive and obsessed with experimentation—always chasing the next idea to push his research forward. When Kurusu nervously asks whether they'd actually die from being shot, Takeuchi's answer is characteristically unhinged: he just shoots Yamagami repeatedly to find out. Later, when Moriyama gets bitten and Maeda mercy-kills him, Takeuchi casually remarks that Moriyama would've made a "valuable sample," making it clear he would've preferred to keep him alive for his own experiments.
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