premise: Protesters run as gas grenades are thrown into the street. hypothesis: The protesters are running from the police who are throwing gas grenades.
neutral: Just because there are protesters who run as gas grenades are thrown into the street, it doesn't necessarily mean that they are running from the police who are throwing gas grenades. Police are not the only people who can throw gas grenades. Just because there are protesters running as gas grenades are thrown, it doesn't mean that there are police there.