As the cube drifts through the gravity device, Chell leaps down from the ledge and swiftly lands on her feet with no damage done, thanks to the Aperture Long Fall boots. Quickly, she scurries over to the lift before the cube reaches the laser it's supposed to reflect.

Good, that didn't take too long. GLaDOS was a decent partner indeed. Well, since she designed the tests, obviously she knew what she was doing. If she didn't, it would obviously be a gesture to annoy her.