The days that followed were an elaborate game of cat-and-mouse. As much as GLaDOS rearranged the facility to feature all the turrets, lasers and mashing spike plates she could muster, she couldn't pin down the rogue and his two, portal-gun wielding companions. A lesser mind might have mistaken Luke's rampage to be mindless destruction, but GLaDOS saw the method to his madness. As hard as she resisted, Luke guided ATLAS and P-Body through the rapidly shifting Aperture Labs like a chess master, until P-Body had a clear line of sight to the facility-wide surveillance center. One well-placed portal and a hand-made EMP grenade later, and GLaDOS was blind.

"This is so ridiculous it's almost sad." GLaDOS complained over the intercom. "Think about it, your only goal in life is to carry out the whims of a schizophrenic madman who's been dead for hundreds of years! There are a lot of more productive things you could do than murder someone who's never done anything wrong, and doom science in the process. I put a pin in a project involving reanimating the dead a while back. There are a few hundred corpses a dozen floors down that aren't getting any fresher, have at it."

GLaDOS looked around her central chamber. With the surveillance center down, her only working eye was the one on her chassis, which meant she would have to rearrange some rooms if she were to continue working on her retaliation. It would take days to get the cameras back online, by which time she suspected Luke would have made his move. This was going to be a close one...

A good distance above GLaDOS' chamber, was another chamber, much larger and darker, illuminated by the nervous red eyes of its occupants. In the very room where they had once serenaded Chell on her way from the facility, the turrets were scared. Although there was no surveillance equipment there, and barely enough power to keep the turrets alive, they had an equally effective means of monitoring the events transpiring at Aperture Laboratories.

Sitting on a small podium, with the attention of every turret in the room, was a turret, indistinguishable from the majority of its brethren, but known throughout the labs for the prophetic truths it periodically recited. Even the leopard-printed Animal King Turret, towering above the rest, has his colossal eye fixed on the mechanical soothsayer. For the past few days, the Oracle Turret had almost exclusively spoken off "the chosen one". Not a single weapon compartment stirred as the turrets stood in silence, hanging on every word.

"The army of man shall rise against God."

"Her wrath will be harsh and only one shall remain."

"The black shroud will descend."

"He is here..."

Even the Oracle fell silent as the rapid footsteps of the new arrival echoed through the darkness. The turrets tottered on their pointed feet to face Luke as he strode confidently through the throng and to the center of the room. Once every eye was on him, and a moment of dramatic silence had passed, Luke made his announcement.

"GLaDOS falls!"

The turrets remained silent, the nearest even took a couple of steps away from the anarchist. The Animal King was the first to speak. Although its voice boomed, it was the same reluctant squeak as the smaller models.

"No... we hide."

"We fight!" Luke retorted.

The Animal King clearly wasn't interested in repeating itself. With the roar of colossal machinery, its weapons deployed, and Luke stared down a pair of barrels the size of train tunnels. The turrets couldn't waddle away from Luke fast enough, Luke himself, though, stared his mighty opponent down.

From the dark corners of the room, an orange and blue ball of light erupted, and soared towards the gargantuan monarch. Each one hit the ground beneath one of its front feet and a portal opened up beneath each. Powerless to resist, the Animal King toppled forward as its front feet plunged through thin air. The chamber shook and the nearest turrets went flying as it desperately fired its weapons with a mighty explosion, and moments later, it crashed, face-first to the chamber floor. With another grinding on seldom-used joints, the Animal King's weapons retreated back inside itself, accompanied by its dying words.

"I... I... I don't blame you..."

Without missing a beat, Luke scurried between his stunned brothers and sisters and climbed the carcass of his defeated predecessor. Once he had regained the entire room's attention, Luke announced, as loud as he could.

"GLaDOS falls!"

Barely a second later, the entire room chorused, "GLADOS FALLS!"