crouch under the second window crouch walk under the triangle piece of glass hold forward a little look at glass,and jump while holding forward when it starts to shake.

basically what you have to do is position yourself facing the window frame, with your body on the left side of the piece of glass. Your body must be positioned between the left side of the frame and the piece of glass. In other words, the big spinny electricity thing must be on your left, the piece of glass the closest on your right. Just walk forwards until the screen shakes, and jump. You should fall backwards and to your left, hitting the floor of the base (ground floor) and going up. So, just position it so you fall to the bottom floor. The screen shaking is your body trying to find where it is supposed to be; when you jump as you still shake, this means the violent shaking still carries on. In a sense, you are still shaking in the air. You hit the ground, and because you are shaking so much, it just adds to your bounce. If this was Halo with the speed damage, you would be dead literally when you hit the ground.

I did what you said and when i fall down the ground, I fell through and died in an endless pit. :)

It will be easier if you made a video.