It’s the same message he was given by the G-Man himself just before the Resonance Cascade of Half-Life 1 that opens an interdimensional portal for various alien forces to invade Earth through, eventually to the point of most of humanity being enslaved by a universal union named the Combine after a mere Seven Hour War (not to mention a plague of headcrab zombies as nuisance value). “Prepare for unforeseen consequences” she unconsciously says, leaving Eli to crash to a nearby couch in shock and fear over what may be to come. Towards the end of Half-Life 2: Episode 2, Alyx Vance approaches her father Eli and relays a message subliminally given to her by the mysterious and sinister interdimensional bureaucrat known as the G-Man.
