How did Qinefer kill Helghast if they're invulnerable?

[allure]

She kills several Helghast throughout the Legends of Lone Wolf series in spite of not possessing any magical weapon. She doesn't appear to be doing anything special either, just swinging at them with her sword. How is that possible?

[laz001]

The exact text - from the book in-front of me is:

It [the giak] was still twitching as Qinefer removed it's sword from its hand and flung it with perfect precision to strike the Helghast directly in the centre of the forehead.

The Helghast clutched at the blade, then turned and ran. It left behind nothing but a shriek of maddened frustration, which the breeze swiftly snatched and dispersed over the surrounding fields, and the Giaks sword, which thudded to the ground

So - she DOESN'T kill a Helghast?

However - hitting it with a black giak sword from the darklands however would give it pause for thought - as far as I remember, weapons forged in Helgedad can harm a Helghast...

[allure]

Which book is this? In my copy of The Birthplace:

The Helghast can see in the dark, thought Qinefer, and I can't. Pretty shrewd for a spawn, pretty shrewd.

She raised her sword as if it were an axe and advanced a few steps, swinging the weapon down in a swift arc.

There was a scream as the blade cut into flesh. A mist of ichor sprayed her eyes, so that they stung as if someone had thrown acid into them.

She forced herself to ignore the pain. She pulled back her sword and struck out again into the darkness, twisting the blade as she drove it forwards.

There was another shrill scream. And then agony as the tip of the spawn's sword slashed across the top of her shin.

Rage swiftly replaced her pain.

The bloodlust was in her.

She didn't recognize her own shriek of fury as she advanced down the stairs into the blankness, sweeping her sword viciously from one side to the other, shouting words that had no meanings to her. Again and again she felt her blade bite into spawn-flesh; again and again she heard the Helghast scream its agony to its Archlord of all Archlords – the God of Darkness himself.

Naar.

And then there was a rapidly diminishing streak of light in her eyes and she was alone. She tested ahead of her with her sword, but there was nothing only the blackness.

Tottering, she returned her sword to its scabbard. The pain in her shin was like a slow fire, and she could feel the blood running down her leg.

She took a tentative step downwards, and then another, expecting at any moment to trip over the body of the Helghast – still alive, still waiting for her.


Then she remembered the shrinking light.


The Helghast was dead.


A long time ago she'd killed a Helghast on the banks of a stream, and she'd seen the creature disappear as if it had never been there.

So she kills a Helghast in this book, and killed another one "on the banks of a stream" (which was during Zagarna's invasion).

[allure]

In fact Carag also kills a Helghast in The Claws of Helgedad:

There was a Helghast in front of them. It towered over Carag.


The creature saw them but apparently, for a moment, couldn't believe its eyes. Its hate-filled stare twitched from Carag to Lone Wolf and back again, and then its right hand swept towards the pommel of its sword. It gave a grunt of disbelief as Carag's blade -- moving at dizzying speed -- punched up through the underside of its chin. It fell backwards, dragging Carag with it. There was a loud crash as the two of them collapsed to the floor.


"Good . . . work," said the Giak, grinning unpleasantly at Lone Wolf and putting a foot on the Helghast's face as he struggled to remove the serrated sword.


"Good work," agreed Lone Wolf dully, sickened. He was always pleased to see spawn die. At the same time, Carag's obvious pleasure in killing disheartened him. The Darklords had bred the Giaks and the other monstrosities conceived by Naar for their qualities of cruelty. Even now, Carag was taking pleasure out of twisting his sword as he extracted it from

the Helghast's throat.

Ignoring all of these thoughts, Lone Wolf snatched the dead Helghast's sword and then the two of them sped on ...

The text clearly says the Helghast is dead. I suppose one could suggest that Darkland weapons can kill Helghast, but if they could do that, then Sommerlund would be silly not to hoard all the Darkland weapons after the Helghast wars, and there would be thousands of serviceable swords in the wake of Zagarna's invasion too that would presumably be distributed country-wide.

Edit: Oh yeah, and the Helghast that Carag kills does not dissolve.