A security guard is responding to a disturbance and observes two individuals engaged in a physical altercation. What principle should guide the security guard's intervention if they decide to use force to break up the fight?

1. The security guard must match the level of force being used by the individuals.
2. The force used must be no more than is necessary and reasonable to prevent further harm and stop the altercation.
3. The security guard should wait for police to arrive, as they have no authority to intervene physically.
4. The security guard can use any force to ensure immediate compliance and dominance over the situation.