Awakened: Finish charging the reactor in under 90 seconds.
You will activate zero gravity and see a reactor in the middle. It starts spinning. This is similar to the drill from the main game in which you must use stasis to slow it down, and then destroy the middle parts. There are valves you can spin on the side to release a type of bomb. Release it and stasis the reactor. Now kinesis and throw the bomb when the the reactor part is showing (the weak point in the middle). This will release a portion of the bottom to rise up and you must shoot it. If you are quick you only have to do this twice. Having a second person can help make this a lot faster.
If you miss this, you can reload your checkpoint or later on revisit this area quicker by using chapter select and selecting Chapter A3.