Declining is not ending the turn
Answering N to a prompt is not the same as ending the turn. The model is told plainly that the specific action was declined, and it continues reasoning from that point rather than stopping.
In practice this often means the model asks what you would prefer instead, or tries a noticeably different approach that avoids whatever made you decline in the first place, treating your answer as real information rather than a dead end.
This is deliberate: a decline is frequently about steering a specific action, not about wanting to abandon the whole request, and the turn's behavior reflects that distinction.
A decline is treated as substantive input, not as noise to be brushed past; the model's very next step is shaped by it directly, the same way any other new piece of information mid-turn would be.
If a decline genuinely does mean you want to stop the whole request rather than adjust one step of it, saying so plainly, "actually, never mind this whole thing," works exactly as directly as declining the individual action did.