You might have to shoot one up into the receptor above and behind you. Once he’s dead, just shoot an energy core into the receptor across from you. He’ll destroy any energy cores you get into the receptors. Grab an energy core and blast the stalker across from you. Ride it down and get ready for a mirror of the last chapter in Half-Life 2. Then get onto the elevator when it arrives. Interesting.įollow her into the control room. It seems like our friends were trying to blow the Citadel up on purpose. The gravity gun can take them out in seconds at this range.