YOU SAID:

We need to find them and stop them before that happens.

INTO JAPANESE

そんなことになる前に、彼らを見つけて止めなければならない。

BACK INTO ENGLISH

We must find them and stop them before this happens.

INTO JAPANESE

これが起こる前に彼らを見つけて阻止しなければなりません。

BACK INTO ENGLISH

We must find them and stop them before this happens.