YOU SAID:
Are you threatening me master today?
INTO JAPANESE
あなたは今日、私をマスターと脅していますか?
BACK INTO ENGLISH
Are you threatening me with a master today?
INTO JAPANESE
今日はマスターで私を脅してるの?
BACK INTO ENGLISH
Are you threatening me with a master today?
That didn't even make that much sense in English.