i love this kind of hero.
i always imagine a scenario like this,
the mc ask friend of hero(heroine) to lend her power to stop disaster, but the hero doesn't let her because the power gonna have impact to her health.
so after that disaster happened hero and heroine gonna regret it as countless people died. and the mc gonna said "it's all your fault"

生きたまま、なにかに食べられるのって無茶苦茶痛そうよね。