"I have to respond in a way that's sharp enough that the person recognises...and does a double-take and realises that he was mistaken in what he'd been told before..."
"I have to respond in a way that's sharp enough that the person recognises...and does a double-take and realises that he was mistaken in what he'd been told before - but I have to avoid making it so sharp that the person's feeling that are hurt. It's a difficult balance."
@49.07mins of "For A Free Digital Society" - Richard M. Stallman [Video link is no-adverts link]
https://redirect.invidious.io/watch?v=7ZSPf7YnGfE&t=49m07s
"For A Free Digital Society" - Richard M. Stallman
[Video page has no adverts / is an Invidious filtered link]