Ur... no one said anything contrary.
It's too obvious from the books anyway.
But the men seemed to have a clear idea what "The Ginger Beer Trick" was working like exactly - after Carcer tought it to the Cable Street Particulars, as far as I remember- otherwise the scaring bit wouldn't have worked so well on them. The question what exactly the "Ginger Beer TrickW was supposed to work like spinned a lot of people's heads.