Crossfire Control
Three-minute crossfires with a hidden goal: each debater has to get one specific concession without showing which question mattered.
Before the drill, each partner secretly writes down one concession they need, a specific admission that would help a later speech ("their impact assumes the law is enforced," "their author is talking about a different policy").
Run a full three-minute crossfire on a case you both know. Hide your target question among others: ask two setup questions that seem harmless, then the one that matters, then move on without reacting.
Afterward, each partner guesses what the other was fishing for. If they couldn’t tell, you win, because that is what disciplined crossfire looks like. If your reaction gave it away, note where and run it again.
Variations
Hostile witness mode
The answering partner is deliberately evasive. Practice the polite pin-down, "So is that a yes or a no?", said without any heat.