YOU SAID:

While you were out partying, I studied the blade

INTO JAPANESE

あなたがパーティーをしている間、私は刃を勉強した

BACK INTO ENGLISH

I studied the blade while you were partying.

INTO JAPANESE

あなたがパーティーをしている間、私は刃を勉強しました。

BACK INTO ENGLISH

I studied the blade while you were partying.