The argument that can't be returned™

The peaceful name for the strongest thing in a debate, and it is stronger than the war word it replaces. The reflex is to reach for a "bomb"; but a bomb ends the conversation, it wins by destruction, and this house is built against exactly that (Books, not bombs; winning is a ruling, never a detonation). So picture the opposite: a serve nobody can return. The strongest argument is not the one that ends the exchange; it's the one so grounded in the record that it comes back every time unanswered, and keeps the rally going longer than the other side can hold. You don't win it with force; you win it by being un-spinnable: true, checkable, and already steelmanned against its own best counter, so there is nothing left to hit back with. It doesn't destroy the opponent; it outlasts them, and it leaves them still standing, still in the conversation, simply out of returns. Sport stays; force goes. Not the strongest bomb; the serve that can't be returned. (His coin; machine's read, refine to his.)