End of the Russian campaign "Demolition"
Alyx: "We might still have-"G-Man: "Time, Doctor Freeman?"
Funfact: Thats the only time he calls him "Doctor" freeman throughout the game.
In a few moments this chamber will be filled with particles that human science hasn't yet named. Maybe I'll name one after you so you won't be completely forgotten. In a few moments you'll be destroyed in every way it is possible to be destroyed, and, well some that are in a sense impossible.