barry, that is an extremely serious issue. as we know, law-abiding concerned citizens who carry a CCW might engage. even if you are just ordered to the ground both of you can be engaged by a shooter. the situation can be chaotic. like you said every situation is different, but unless you are actively engaging, being ready without gun drawn might be your best bet. I mean you might get shot exiting the mall too.
"Damn the torpedoes, full speed ahead!" -Admiral Farragut @ Battle of Mobile Bay 05AUG1864