Use the third switch.
This raises the last section of bars up on the ceiling and opens the metal grate on the central structure above and behind you.
Turn around and walk to the edge of the alcove, jump to grab the rock ladder, and climb upward...
...right, then up a little more into the alcove you just opened.
Turn around and take a carefully angled standing jump from the corner of the alcove near the grate to the long, sloping ledge ahead on the right.
Slide back and grab the edge of the slope.
Traverse to the middle of the slope, pull up and immediately backflip...
...onto the pillar where the save crystal was. Climb back up to the doorway just as you did before.
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