YOU SAID:
You killed 8 people in BMX Cycling.
INTO JAPANESE
あなたはBMXサイクリングで8人を殺しました。
BACK INTO ENGLISH
You killed 8 people on BMX cycling.
INTO JAPANESE
あなたはBMXサイクリングで8人を殺しました。
BACK INTO ENGLISH
You killed 8 people on BMX cycling.
That didn't even make that much sense in English.