Do owners of property maintain authority during terror. Yes and no.

Businesses are not allowed to endanger citizens by placing them in a dangerous place during terrorism. If there is someone who is shooting people out in the parking lot the stores

even past hours

even if it takes months Hostage to stop the terror

They can not force you out until the police and others can get you to safety

Also the cops, military are suppose to bring food drinks and resources to the victims. Many people have dealt with terrorist and food was allowed in

Tech terror is one of the worse. It’s not the same as a shooting it more dangerous.