Instructions
Stand near the first dragon head statue. Look for an F-Energy vent to the left of the statue. It looks like a dome of green mist coming from the floor.
Walk up to the F-Energy vent and a button prompt will appear at the bottom of your screen. Press "A" to activate the vent.
Look at the puzzle next to the F-Energy vent. There are a series of blocks with mirrors and a beam of light emitting from one of the blocks. Move the mirrors from the two blocks that are directly in front of the one emitting the light beam. This will deactivate the three dragon statues.