YOU SAID:

i once killed a fly by throwing my phone at it

INTO JAPANESE

私はかつてハエに電話を投げてハエを殺しました

BACK INTO ENGLISH

I once threw a phone at a fly and killed it

INTO JAPANESE

私はかつて電話をその場で投げて殺した

BACK INTO ENGLISH

I once threw a phone on the spot and killed

INTO JAPANESE

私はかつてその場で電話を投げて殺した

BACK INTO ENGLISH

I once threw a phone on the spot and killed