I say - OUTRAGEOUS!!
I could be wrong here, correct me if I am somebody..........BUT, in any facility, "drills" (fire, disaster, etc.)....are first established by POLICY and PROCEDURE, having been written up and approved by "whoever". I'd head for the facility's P & P Manuals and find the one for: "Domestic Violence Drill"....which, if it exists, is part of every new hire's Orientation, or should be.
Domestic Violence is no "game" and to spring this kind of a "drill" on unsuspecting Staff, patients, family members, visitors and anyone else is pretty sick thinking if you ask me.
How do they justify this "drill", given there is no policy and procedure in place for guiding Staff in advance of such a possibility? They are damn lucky nobody pulled out a loaded gun, or called the Police, believing it was the real deal!
I'd be on the phone, in the face of my Manager, DEMANDING to see the Policy and Procedure for this scenario, because it is your Supervisor's responsibility to have educated all Staff on that Unit, if one does exist!
Follow up, and let us know what you are told. We are in enough of a "war zone" day in and day out, without management creating it for us.
Just when you think you've "heard everything".........