The Right Remark
I did a lot of debating as an undergrad. (Though I don’t talk about it now that I live in the U.S., because American college debating has, um, a slightly different vibe from the kind found in Ireland, the UK and Australia.) A lesson from all that public arguing is that, sometimes, the best way to cut the knees out from under your opponent is to say almost, but not quite, exactly what he said himself.