"Decisions shape environments, and environments shape decisions.
In a rewrite proposal that assumes the ending is known, discussion starts to feel like progress. It is motion without a boundary.
When the decision stays implicit, the system still commits—by drift, escalation, or whoever speaks last. You see it in a decision that drifts because nobody writes the boundary, where the first clear call happens after the cost has already been paid. Keep it calm, concrete, and small; the goal is a move you can repeat, not a speech you can admire. Define the decision rights before the crisis, or the crisis will define them for you.
Write the hidden assumption as a sentence, then choose the signal that would break it. That is how you keep pressure from rewriting the decision. Be calm and explicit.