Push the block off the crystal to make it rise and split the beam of light into two. Kill the enemies next. Once clear push the stone block to the left and pull the lever there to lower the beam of light. Don't forget to collect the red orbs to its left. Next, jump to the lower floor and push the stone to the right and use it to reach the ledge. Collect the red orbs to the right then use the ladder to reach two white chests above.
Jump to the left and step on the conveyor belt. Leave your shadow there and quickly jump back to the lower floor and make your way to the left. Wait for your clone to slowly get near the end of the belt then operate the chains to extend the piece that will lock the crystal in place. Make sure that the metal hook is extended already before the shadow lands on the crystal. When timed correctly, the shadow's weight will cause the crystal to descend and the hook will automatically lock it in place. The ladder to the left will be lowered once done. Climb up the ladder to exit the statue through its helmet.