NeStirrath wasn't happy to sing such song to another female and spend time with Rethothanna but agreed on singing it to Rugaard, sending him later to the dragonelle.
It appears the song is clearly not the NeStirrath's mating-song, containing elements occurred after the Esthea's death, however it possibly shared some common first parts.
When CuTar’s sons in battle met
One perch but we nine who sought
Two-score dragons fell to earth.
In Rednight’s reckoning fought
Three lines at war for power’s pride
Black murder just a tool
AgMemdius struck, my hatchlings died
A bloody cave I found
An anguished roar, a wish for death
I sought my bloodstained foe
And over Kog’s hill, trading breath
We perished, each aflame…