He deposits Freeman back in stasis, this time without giving him "the illusion of free choice".  "" rejoins Gordon and Alyx Vance, who are separately removed from the G-Man's stasis by the Vortigaunts and rescued a split second before the reactor explosion, greatly displeasing the G-Man. Gordon regains consciousness under a pile of rubble and is found by Alyx and Dog. Their proximity to the Citadel, coupled with its imminent explosion, which would level much of City 17, requires them to go back inside and stabilize the core, stalling the structure's destruction long enough for both themselves and much of the human population to escape. Gordon and Alyx succeed in doing so, but learn that the local Combine forces are attempting to send a distress message for off-world assistance, using the Citadel's destruction to power the transmission. The Combine consider this a positive, as the subsequent explosion would destroy all of City 17 and much of the surrounding countryside, which has been all but lost to human resistance forces. With a copy of the distress message, Gordon and Alyx escape the Citadel and meet up with Barney and other survivors. The pair escape City 17 via an evacuation train as the Citadel core goes critical, sending out the Combine message. The resulting shockwave derails their train. In "", Gordon wakes up in the wrecked train and is freed by Alyx, who had earlier escaped the wreckage. A massive superportal is forming over what was once City 17, which will allow the Combine to send an invasion fleet once it is fully formed. The data they carry is the key to destroying it. Gordon and Alyx make their way to White Forest, an apparent Soviet-era missile base turned into a rebel stronghold, where the data can be sent to an orbiting satellite via a rocket, which will allow the resistance to collapse the portal. After Alyx is critically wounded by a Hunter, Gordon assists the Vortigaunts in saving her, their healing ritual giving the G-Man the opportunity to speak to Gordon. During this conversation, the G-Man reveals to Gordon that he saved Alyx from the Black Mesa incident. He also embeds a message in Alyx's brain for her father, Eli: "prepare for unforeseen consequences." When the duo reaches White Forest, after a run-in with a Combine Advisor, they are reunited with Dr. Kleiner and Dr. Eli Vance, and are formally introduced to Dr. Arne Magnusson, who has taken control of the base. After Gordon seals the silo from a Combine attack, Gordon, Alyx, Dr. Kleiner, and Dr. Eli Vance watch the transmission from Dr. Mossman seen in "Episode One", acquired with the stolen Combine data.