When you save Beth then Stephanie rushes away how do you save Stephanie?

There is a area to your right where you go across then you will see a latter,climb up it. After that you'll be on the bridge,go to the opposite side that you started on and there will be a large sign on the ground,you can't push it by yourself so you need the help of beth's mother,when you have moved and are on the sign climb up the blue umbrella thing coming off the wall of the buiding,there you will see another latter,don't climb it(unless you want an object) Then cross the big red sign and there lies Stephanie,you pick her up and carry her down the the thing shes laying on and you'll see a latter,climb it and there will be a string of lights,once you get on that you will notice a HUGE mound of debris coming torward you,you need to hold on tight because just R1 won't save you,after it passes,shimmy across the lights and get down. And thats the end of that..