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- "Our bonds are of nature and require no gratitude."
- ― Lone Vort[src]
The Lone Vort was traveling in the woodlands not far from White Forest after the destruction of the Citadel at the end of Half-Life 2. At the time of Half-Life 2: Episode Two, he was hunting alongside several other Vortigaunts for Advisors not far from a large series of Antlion-controlled tunnels. He called off his hunt momentarily during the chapter To The White Forest when he found Gordon Freeman trapped alongside a badly injured Alyx Vance. Setting Gordon free, he then took Alyx under his care, stabilizing her condition.
During a brief time during which Gordon and the Lone Vort were separated, the Vortigaunt brought Alyx to a small tunnel occupied by the Resistance members Griggs and Sheckley. When Gordon and the other Vortigaunts arrived, they determined that, to save Alyx, they would need to retrieve the larval extract from deep within the Antlion Hive, a mission that they entrusted to Gordon Freeman and the Vortigaunt.
In the chapter This Vortal Coil, Gordon and the Lone Vort traveled into the hive, evaded the hostile Antlion Guardian, retrieved the vital extract, and worked their way back to Sheckley and Griggs' hideout to restore Alyx to health. With Alyx healed but still weak, the Lone Vort decided to escort her and Gordon to the surface, where, in the chapter Freeman Pontifex, he helped them battle through Antlion and Zombie hordes to reach the Muscle Car. Upon them reaching their destination, the Vortigaunt bid them farewell and returned to hunting Advisors, but not before Alyx gave him a friendly kiss on the head.
Behind the scenes
In the Victory Mine, the Lone Vort says at some point "What next in the parade of constant obstacles?", a variant of one of Dr. Magnusson's sayings, "What next in the parade of constant interruptions?". According to Marc Laidlaw, the affinity between the Vortigaunts and Dr. Magnusson has caused some of his mannerisms to spread among them by way of their lowgrade telepathy.