A/N: Thanks for reading! Please review my first Portal fanfic. I should have more coming soon but it will take a while.

"Congratulations. You just worked out how to shut me down. You chose this path and now I have a surprise for you. Deploying surprise in 5...4…"

Suddenly, a green gas billowed into the main chamber. There was no doubt what it was, and apparently it had less than 5 minutes to do what it was meant to do.

The Neurotoxin continued to fill the room.

GLaDOS talked menacingly; "Your life is a mathematical error – a mathematical error I'm about to correct!"

I panicked. The shutdown button was a trap! What is going on? I have to get Zoa to attach that core onto her! I could see her down there, coughing and spluttering in the toxin. Her eye met mine, wild and desperate. But after a few seconds, it turned to fierce determination. She stumbled toward the glass platform underneath GLaDOS. I glanced at the countdown clock. 4 minutes. I need a face mask. I turned and ran out of the room; the medical room I knew wasn't too far away. But time was running out, I had to get there now! I came into the reception office where bodies lay slumped while Neurotoxin billowed out of air vents, confirming their deaths. I covered my face and crawled to a door on the side. The medical room. Blindingly, I staggered in and opened a cupboard on my left where face masks lay on the top shelf. I grabbed them and looked at my watch. 1 and half minutes to go. I grabbed a bundle and sprinted out and toward the main chamber. As I ran, I could feel the time slipping away and even worse, the neurotoxin reaching Zoa's brain. It was painful trying to run as faster than I could go but I eventually made it into the lobby which acted as the entrance to the main chamber.

And there she was.

Zoa staggered up onto the glass platform as GLaDOS was murmuring about how she was going to die very soon.

"Ok do whatever you think you're doing. Surviving? Is that your goal? Well it's going to fail very soon. And I mean VERY SOON."

I looked wide-eyed at the scene. I noticed my camera on the floor and I picked it up and quickly pressed RECORD.

The last few seconds were critical. Zoa who was weakened but determined raised the core high in the air. Her presence was triumphant, and at the last possible moment, when the countdown was at the final 3 seconds and GLaDOS's single glowing eye seemed to widen, she struck the core down onto her body.

And all went quiet.