YOU SAID:

if i move my hands fast enough i won't die

INTO JAPANESE

手を十分速く動かせば死なない

BACK INTO ENGLISH

If you move your hands fast enough, you won't die.

INTO JAPANESE

手を十分に速く動かせば死ぬことはありません。

BACK INTO ENGLISH

If you move your hands fast enough, you won't die.