He or she may interrupt, thus preventing a conclusion from being reached. Perhaps they will use the childish tactic of making personal an argument that should be kept clean. It is not a sophisticated weapon, but an easy one to use. The decibel level of current discourse is deafening. Where once a man or woman was judged by the persuasive tone of their voice, today they are judged by how loudly they can scream their ill-formed opinions.
Current discourse is no longer an artform guided by rules and requiring mental preparation.
It is noise pollution, verbal dissonance. It requires nothing more than passions be properly inflamed. Liberalism strikes intellectualism from debate. There are no ground rules, no framework in argument. Even logic itself, a liberal will argue, is relative.