If a person has not been attacked, than what threat of IMMEDIATE grave bodily harm exists? If the immediate threat does not exist, resulting from an attack already begun, than how can the concealed firearm be used to prevent the attack?
This is the LAST bit of spotlight I'm gonna give you...
There is ALWAYS a POSSIBILITY of GRAVE BODILY HARM BEFORE and DURING a violent encounter because you DON'T KNOW what the ATTACKER is capable of doing OR what weapons they have CONCEALED on their person!
So the question to you NAVYLCDR is DO YOU RULE OUT the fact that there is or could be NO IMMEDIATE threat of GRAVE BODILY HARM?
NOW...
Using YOUR hypothetical situation.... If someone APPROACHES you in a THREATENING manner meaning that your reactionary response is either to stand guard and fight or flee, it can and usually WILL BE be CONSIDERED an ATTACK!
Therefore...
If one DOES NOT APPEAR to be ARMED and the ATTACKER is approaching the person in a THREATENING MANNER then the ELEMENT OF SURPRISE kicks in when you BRANDISH your firearm that the ATTACKER DID NOT know you had on you!
THEREFORE...
PREVENTING THE ATTACKER from doing ANY physical harm!
(rocket science I tell you...)