Tsukasa demands that Senku abandons science, but there’s no way he can do that. Tsukasa is left with no choice but to kill him.
He didn't suffer.
.لم يعانِ
Er hat nicht gelitten.
No sufrió.
No ha sufrido.
Il n’a pas souffert.
Lui non sta soffrendo.
Ele não sofreu.
Ему не больно.