YOU SAID:

I've killed twelve, dumbass scientists!

INTO JAPANESE

私は 12 人を殺しました、愚かな科学者!

BACK INTO ENGLISH

I killed 12 people, stupid scientist!

INTO JAPANESE

12人も殺したんだ、愚かな科学者よ！

BACK INTO ENGLISH

You killed 12 people, stupid scientist!

INTO JAPANESE

12人も殺したんだよ、愚かな科学者！

BACK INTO ENGLISH

You killed 12 people, you stupid scientist!

INTO JAPANESE

12人も殺したんだよ、この愚かな科学者！

BACK INTO ENGLISH

You killed 12 people, you stupid scientist!