A concession changes the position of a case. It needs an owner, a limit, and a clear account of what is expected in return. Without that record, a sequence of small moves can become an unintended commitment.
R2D uses a concession ledger and agreed caps to keep those changes visible to the sponsor. Evidence and authority come before the next move, while one channel maintains a consistent account of the discussion.
The purpose is to make reciprocity explicit and controlled. A proposed concession is assessed against the selected route, its stop-loss, and the Rules of Engagement already accepted by the sponsor.