When the blades roll away again, turn around and follow them but wait at the top of the downslope.
As they begin to roll down the opposite slope toward you, start running and jump over them.
Make sure you run straight forward along the seam so you jump over the blades at the "axle," as shown above. Otherwise she'll get hurt.
Run up the slope, duck near the seam on either side of the third button, and wait for the blades to come and go once more.
When the blades roll away, stand up, sidestep twice toward the third button and press it.
Then sidestep twice to get back to the seam, duck and wait.
When the blades roll away, run to the fourth button, press it...
...sidestep back to the seam and duck once more.
Once you've pressed all four buttons, the door opposite the entrance opens. After the blades roll away, stand up, run down the slope, and veer into the doorway where it's safe.
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