How do I save Robert in Panopticon?

You'll enter a room filled with rotating saws. From the ceiling you will see pipes. Lowered down from the ceiling will be 3 electrical outlets. You need to shoot the correct electrical outlets in a specific order to progress further. 

1. Shoot a weapon crate to unlock your stun gun 
2. Shoot the electrical outlet which links to Robert
3. Very quickly, shoot the electrical outlet that connects to you, so that the walls don't crush you
4. This will send enough electric through from the outlet down to the barricade in front of you which will let you progress and will remove a saw from Robert.

You also need to be aware that the rotating saws are slowly moving towards you, so you must shoot the correct electrical outlets and get through this puzzle in time or you will also die.