Arriving to the Black Mesa East late in the evening Gordon meets Dr. Judith Mossman for the first time, and is reunited with Resistance Leader and former Black Mesa Scientist Eli Vance and Alyx. Gordon is also introduced to the Zero Point Energy Field Manipulator, also known as the 'Gravity Gun', a physics manipulator that quickly becomes indispensable, and after that, Gordon meets Dog, Alyx's robotic "pet." Like A Red Letter Day, this chapter is full of insight and dialogue about the current state of the world, the people in it, and the aftermath of the Black Mesa Incident. While Gordon is playing with Dog in the scrapyard, Alyx spots Combine Scanners sweeping the area, shortly before an all out aerial raid on Black Mesa East. While attempting to rejoin the others, Gordon and Dog are separated from Alyx by a collapsed ceiling, and Gordon is forced to escape down a tunnel to Ravenholm, a place that Alyx didn't want to talk about earlier, showing obvious discomfort at the thought.
