Someone comes running screaming out of it with their arms flailing in the air. Another portal quickly opens up 10 meters ahead of them and they run into it. A long mechanical arm quickly protrudes from the first portal and enters the second one, grabbing the person and drags them very fast back into the first portal.
GLaDOS' face peeks out from the first one and looks at you with a disappointing look.
"There is nothing to see here, human. Just an experiment that have gone awry. Carry on.."
GLaDOS pulls back into the portal before it closes.