On May 18, 1980, the volcano Mount St. Helens in Oregon erupted, killing 57 people and earning the title of being the deadliest and most destructive volcanic eruption in the history of the United States. One of those who died was Dr. David Johnston, a USGS scientist who was manning an observation post six miles away. He first reported the eruption, radioing to his USGS coworkers, "Vancouver! Vancouver! This is it!" before his radio went silent. His body was never found, although construction workers found fragments of his trailer in 1993. How could Johnston’s radio message be considered an example of Lasswell’s linear model of communication?