Good catch. That's actually a leftover line from an older version that I forgot to update.
The option to spare Nyra was intentionally removed. After reworking the route, I decided that critical decisions should have permanent and meaningful consequences, and the old "spare Nyra" outcome didn't really fit that direction anymore.
At the moment, Nyra only survives if you allow Caleb to be the one who dies. Likewise, if Caleb survives, Nyra's death becomes the outcome of that branch.
Going forward, most major decisions will follow a similar philosophy. When the game presents a critical choice, the consequences are intended to be significant and long-lasting rather than easily reversible. 👍