YOU SAID:
He's probably still slinging three eighty.
INTO JAPANESE
彼はおそらくまだ三八十を投げています。
BACK INTO ENGLISH
He is probably still throwing thirty.
INTO JAPANESE
彼はおそらくまだ30を投げています。
BACK INTO ENGLISH
He is probably still throwing thirty.
That didn't even make that much sense in English.