The verse goes on like this:

"Her sisters near dead,
'Save her,' he’d said
'She’ll open the gates'

But foes of one day
Ally straight away
If a witch waits

Attaryl
Hearts empty still
The Bessis wed

Sick to the core
Of woe and war
With truce went ahead

Peace at a price
Army, sacrificed
By the Attaryl"

She saved her sect at the price of her lover's life. The lady did tell him to turn around, but as we know, he didn't.