MSQ, particularly Y'shotla

Why was there a pause followed by the eerie sound effect causing Y'shotla to change what she meant to say to Runar at their final farewell?

I guess it can be read few ways. One, she realized in the moment the right thing to say was a message of hope instead of an academic view of "change" is a part of life. But wouldn't that be easily accomplished by having her stop mid-sentence, have a pregnant pause, then change her tune? Why have the eerie sound effect?

Or second, she knows something the rest of us don't? Meaning the reunion with First and it's people will be coming down the road in the future? But how could she even know this and if she is going out of her way to hide it, why let herself slip at that moment?

Or lastly, (after I rewatched the cut scene) the phrasing almost seems like she is planting the idea of being summoned by the Night's Blessed, which as a Scion is counter-intuitive. Maybe I'm reading into it too much?

But why the eerie sound effect? Is there something here I'm missing?