YOU SAID:

Ask him a question and he vanished in a second

INTO JAPANESE

彼に質問すると彼は一瞬で消えた

BACK INTO ENGLISH

When I asked him a question, he disappeared in an instant.

INTO JAPANESE

私が彼に質問すると、彼は一瞬のうちに消えてしまいました。

BACK INTO ENGLISH

I asked him a question and he disappeared in an instant.

INTO JAPANESE

私が彼に質問すると、彼は一瞬のうちに消えてしまいました。

BACK INTO ENGLISH

I asked him a question and he disappeared in an instant.