So what information does H&C need? … H&C seems to me to be turning the conversation at every step towards Zabini’s mother. Eventually, he receives the information that Zabini doesn’t know how his mother persuaded her last suitor to marry her.
I think you might be overthinking things. H&C keeps bringing the conversation around to the consequences of serial betrayal. One off-hand remark (the “keyed into the wards” comment) leads Zabini to think about his guesses as to who H&C might be. The Obliviation only comes after Zabini thinks to himself that no one gave him a chance to sell out H&C.
I think you might be overthinking things. H&C keeps bringing the conversation around to the consequences of serial betrayal. One off-hand remark (the “keyed into the wards” comment) leads Zabini to think about his guesses as to who H&C might be. The Obliviation only comes after Zabini thinks to himself that no one gave him a chance to sell out H&C.