The four of them head to the warehouse, where they find the gas stored inside asthma inhalers. Suddenly, Mulder arrives to arrest them, but two dark-suited men come to take Susanne. They fire at Mulder, hitting the boxes behind him and exposing him to the gas. The exposure causes Mulder to strip naked, hide in the box, and hallucinate about seeing aliens in the warehouse. Susanne shoots the men and escapes. More men then arrive, led by X, who intimidates the Lone Gunmen. Byers confronts X, asking him about his actions and mentioning the supposed cover-up of the John F. Kennedy assassination. X's unconvincing denial — "I heard it was a lone gunman" — becomes the origin of the trio's name. X leaves, just as the police arrive and arrest the Lone Gunmen.