The wound ran so deep that the Crone Swords' continued presence had begun to drain Slaanesh's power, little by little.
Alarmed by that loss, Slaanesh summoned every ounce of strength to pull the Crone Swords out.
Slaanesh was no longer especially worried about Boss Slick. Given the strength of the Realm of Delights, breaking out would take him a great deal of time.
Even after he escaped, Boss Slick would probably have no time to cause Slaanesh any more trouble. By any reasonable logic, his priority would be to leave immediately and find a way to stabilize his divinity.
Slaanesh feared Nurgle returning to continue their battle, and feared Khorne even more. That mad Blood God had a bitter feud with Slaanesh over their divine authority: battle lust. To seize Slaanesh's authority over battle lust, Khorne would gladly tear Slaanesh apart.
In truth, all those worries were unnecessary. Slaanesh would not even survive Boss Slick.
While Slaanesh pulled at the swords and let those thoughts run wild, Boss Slick's consciousness had already coalesced within the Realm of Delights.
Raising his great hammer in both hands, Boss Slick brought it crashing down on the enormous cocoon before him. This time, no power remained to protect it, and he smashed it to pieces.
Liquid gushed from the cocoon, spilling out the Slaanesh wrapped inside.
This was Slaanesh's most humanlike form yet: a serpentine lower body, two rows of breasts on the upper body, and flowing purple hair draped over snow-white skin. Deep terror filled that beautiful, androgynous face.
Slaanesh tried to crawl away across the ground. With the cocoon shattered, Slaanesh was at the most vulnerable moment.
Boss Slick seized Slaanesh's tail, hoisted Slaanesh high, and slammed Slaanesh viciously into the ground.
The impact was so heavy that Slaanesh stopped struggling altogether.