YOU SAID:

if you go down stairs you may never come back up, ever

INTO JAPANESE

階段を下る場合、戻ってこないことを今まで

BACK INTO ENGLISH

You will not come back down the stairs, until now

INTO JAPANESE

戻っていないが、階段を下りて今まで

BACK INTO ENGLISH

Will not go back down the stairs until now

INTO JAPANESE

戻っていないが階段を下りて今まで

BACK INTO ENGLISH

Will not go back down the stairs until now