I'd probly already be gone from the area, since I have a car and nothing worth dying for besides my guns, but if for whatever reason I was still there I would tell them, from what went on, that they can take my gun, but they will take him out in a body bag.
Lets see how many disarmed citizens get killed because of this. I for one seriously believe that I would be able to pull the trigger in that situation. (None of us know until we have to.) Do they have any LEGAL authority to do this???