I didn’t do debate in high school, but I remember a class in the late 80s we had a class “world crisis” which covered the past/current states of Chile, Cuba, Ireland, Israel and South Africa.

We were supposed to debate a South African about apartheid. He couldn’t make it so we debated our teacher (who made his opinions known he was not a fan). He destroyed our arguments one by one. We knew for the rest of the class we would have to up our game.