Another video shot by a custom bike show owner shows motorcyclists surrounding the truck. It doesn't show what happened just before one of the bikers starts trying to smash the pickup driver's side window with his helmet. But Dale Kiesgen, who posted the video to Facebook commented on what sparked the violent encounter. He also writes that the truck driver forced his vehicle into the pack of bikers who were riding in the group. In a group rider, bikers try to stay tightly packed for safety, so other vehicles don't get in between, breaking them apart.