At what point is it valid to brandish a weapon to prevent others from being injured or killed? The scenario is that someone breaks into my tenant's apartment and I hear screams for help. Should I always call the police first? Part of me says to react and call the police ASAP once I know that my tenant is not at risk. The problem is compounded because the situation is blind and 911 is notoriously slow and will likely direct me to stay away.